Charging circuit and mobile power supply device

Abstract

The embodiment of the utility model provides a charging circuit and a mobile power supply device, and belongs to the technical field of charging, the charging circuit comprises a wireless charging coil, a charging module, a power supply management module and a battery module, the wireless charging coil is used for supplying power to equipment to be charged; a first port of the charging module is connected with the wireless charging coil, and the charging module is used for being in communication connection with the to-be-charged equipment and obtaining charging voltage required by the to-be-charged equipment; a first port of the power management module is in communication connection with a second port of the charging module, and a second port of the power management module is connected with a third port of the charging module; the battery module is connected with the power management module; wherein the power management module is used for boosting the output voltage of the battery module according to the charging voltage, and according to the embodiment of the invention, the cost can be reduced while the charging efficiency is guaranteed, and the use experience of a user can also be improved.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a charging circuit and a mobile power supply device. Background Technology

[0002] In order to achieve high power output and accelerate charging efficiency, the charging circuit of existing mobile power devices generally needs to be designed with two-stage boost management circuits. The two-stage boost management circuits boost the low voltage output by the battery module, for example, from 3.3V to 9V or 12V, and then from 9V or 12V to about 19V.

[0003] However, in the two-stage boost management circuit scheme, adding another boost management circuit will bring some significant problems. First, adding another boost management circuit will reduce the overall circuit efficiency, increase energy consumption, and thus cause serious heat generation problems, affecting the user experience. On the other hand, adding another boost management circuit will increase the size and weight of the product, which will not only increase the cost but also make it less portable for users.

[0004] Therefore, there is an urgent need to design a charging circuit that can not only reduce costs but also improve the user experience while ensuring charging efficiency. Utility Model Content

[0005] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide a charging circuit and a mobile power device that can not only reduce costs but also improve the user experience while ensuring charging efficiency.

[0006] To achieve the above objectives, in a first aspect, embodiments of this application propose a charging circuit, comprising: a wireless charging coil, a charging module, a power management module, and a battery module; the wireless charging coil is used to supply power to a device to be charged; a first port of the charging module is connected to the wireless charging coil, and the charging module is used to communicate with the device to be charged and obtain the charging voltage required by the device to be charged; a first port of the power management module is communicated with a second port of the charging module, and a second port of the power management module is connected to a third port of the charging module; the battery module is connected to the power management module; wherein: the power management module is used to boost the output voltage of the battery module according to the charging voltage.

[0007] According to the embodiments of this utility model, a charging circuit has at least the following beneficial effects: During the charging process where the device to be charged is in contact with the wireless charging coil, the charging module is used to communicate with the device to be charged and obtain the charging voltage required by the device. The first port of the power management module is communicated with the second port of the charging module to receive the charging voltage data transmitted by the charging module. Furthermore, the battery module is connected to the power management module, and the power management module performs a first-stage boost on the voltage provided by the battery module according to the charging voltage. The second port of the power management module is connected to the third port of the charging module to output the boosted voltage to the charging module. The charging module is connected to the wireless charging coil so that the wireless charging coil outputs the boosted voltage to power the device to be charged. Compared with the scheme of designing a two-stage boost management circuit, the low voltage output by the battery module can be directly adjusted to the charging voltage required by the device to be charged through the power management module. On the one hand, it can not only improve the boost efficiency, but also save one power management circuit, making the overall circuit more compact, thereby reducing the product size and making it convenient for users to carry. On the other hand, the charging efficiency is improved, energy consumption is reduced, and heat generation is better improved.

[0008] In some embodiments, the system further includes a first switching module, which includes a first MOSFET chip and a first capacitor. The drain of the first MOSFET chip is connected to a second port of the power management module, the gate of the first MOSFET chip is connected to a fourth port of the power management module, the source of the first MOSFET chip is connected to a third port of the charging module and one end of the first capacitor, and the other end of the first capacitor is grounded.

[0009] In some embodiments, a short-circuit protection module is also included, which is connected to the battery module.

[0010] In some embodiments, the system further includes a first charging interface module, which includes an interface chip, a first voltage regulator circuit, a first filter circuit, and a second MOSFET chip. The first port of the interface chip is connected to the first terminal of the first voltage regulator circuit and the first terminal of the first filter circuit, respectively. The second terminals of the first voltage regulator circuit and the first filter circuit are both grounded. The third terminal of the first filter circuit is connected to the source of the second MOSFET chip. The gate of the second MOSFET chip is connected to the fifth port of the power management module, and the drain of the second MOSFET chip is connected to the second port of the power management module.

[0011] In some embodiments, the first voltage regulator circuit includes a second capacitor and a first bidirectional Zener diode. One end of the second capacitor serves as the first terminal of the first voltage regulator circuit and is connected to the first port of the interface chip and the first terminal of the first filter circuit, respectively. The other end of the second capacitor serves as the second terminal of the first voltage regulator circuit and is grounded. The second capacitor is connected in parallel with the first bidirectional Zener diode.

[0012] In some embodiments, the first filter circuit includes a first resistor and a third capacitor. One end of the first resistor serves as the first terminal of the first filter circuit and is connected to the first port of the interface chip and the first terminal of the first voltage regulator circuit, respectively. The other end of the first resistor serves as the third terminal of the first filter circuit and is connected to one end of the third capacitor and the source of the second MOS transistor chip, respectively. The other end of the third capacitor serves as the second terminal of the first filter circuit and is grounded.

[0013] In some embodiments, the second port of the interface chip is connected to the sixth port of the power management module, the third port of the interface chip is connected to the seventh port of the power management module, the fourth port of the interface chip is connected to the fourth port of the charging module, and the fifth port of the interface chip is connected to the fifth port of the charging module.

[0014] In some embodiments, a second charging interface module is further included. The second charging interface module includes a second voltage regulator circuit, a second filter circuit, and a third MOSFET chip. The sixth port of the charging module is connected to the first terminal of the second voltage regulator circuit and the first terminal of the second filter circuit, respectively. The second terminal of the second voltage regulator circuit and the second terminal of the second filter circuit are both grounded. The third terminal of the second filter circuit is connected to the source of the third MOSFET chip. The gate of the third MOSFET chip is connected to the eighth port of the power management module. The drain of the third MOSFET chip is connected to the second port of the power management module.

[0015] Secondly, embodiments of this application provide a mobile power supply device, comprising: a housing and a charging circuit as described in any embodiment of the first aspect, the charging circuit being disposed within the housing.

[0016] In some embodiments, the device further includes a heat sink and heat insulation cotton. The battery module in the charging circuit is disposed below the wireless charging coil in the charging circuit. The heat sink is disposed between the wireless charging coil and the battery module by stamping. The heat insulation cotton is disposed between the heat sink and the battery module. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is a system architecture diagram of a charging circuit provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram showing the connection between the charging module and the wireless charging coil in a charging circuit provided by an embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of a power management module in a charging circuit provided by an embodiment of the present invention;

[0022] Figure 4 This is a connection diagram of a first switch module, a first charging interface module, and a second charging interface module in a charging circuit provided by an embodiment of this utility model;

[0023] Figure 5 This is a schematic diagram of an interface module in a charging circuit provided by an embodiment of the present invention. Detailed Implementation

[0024] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0025] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] In order to achieve high power output and accelerate charging efficiency, the charging circuit of existing mobile power devices generally needs to be designed with two-stage boost management circuits. The two-stage boost management circuits boost the low voltage output by the battery module, for example, from 3.3V to 9V or 12V, and then from 9V or 12V to about 19V.

[0028] However, in the two-stage boost management circuit scheme, adding another boost management circuit will bring some significant problems. First, adding another boost management circuit will reduce the overall circuit efficiency, increase energy consumption, and thus cause serious heat generation problems, affecting the user experience. On the other hand, adding another boost management circuit will increase the size and weight of the product, which will not only increase the cost but also make it less portable for users.

[0029] Based on this, the present invention provides a charging circuit and a mobile power supply device, which can not only reduce costs but also improve the user experience while ensuring charging efficiency.

[0030] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0031] Reference Figures 1-5 In a first aspect, this utility model provides a charging circuit, including: a wireless charging coil 100, a charging module 200, a power management module 300, and a battery module 400; the wireless charging coil 100 is used to supply power to the device to be charged; the first port SW1 of the charging module 200 is connected to the wireless charging coil 100, and the charging module 200 is used to communicate with the device to be charged and obtain the charging voltage required by the device to be charged; the first port of the power management module 300 is communicated with the second port of the charging module 200, and the second port VBUS_1 of the power management module 300 is connected to the third port AVIN of the charging module 200; the battery module 400 is connected to the power management module 300; wherein: the power management module 300 is used to boost the output voltage of the battery module 400 according to the charging voltage.

[0032] According to a charging circuit provided in this embodiment of the present invention, during the charging process where the device to be charged is in contact with the wireless charging coil 100, the charging module 200 is used to communicate with the device to be charged and obtain the charging voltage required by the device. The first port of the power management module 300 is communicated with the second port of the charging module 200 to receive the charging voltage data transmitted by the charging module 200. Further, the battery module 400 is connected to the power management module 300, and the power management module 300 performs a first-stage boost on the voltage provided by the battery module 400 according to the charging voltage. Furthermore, the second port VBUS_1 of the power management module 300 is communicated with the first port of the charging module 200. The three-port AVIN connector outputs the boosted voltage to the charging module 200. The charging module 200 is connected to the wireless charging coil 100 so that the wireless charging coil 100 outputs the boosted voltage to power the device to be charged. Compared with the design of a two-stage boost management circuit, the power management module 300 can directly adjust the low voltage output by the battery module 400 to the charging voltage required by the device to be charged. On the one hand, it can not only improve the boost efficiency, but also save one power management circuit, making the overall circuit more compact and reducing the product size, making it convenient for users to carry. On the other hand, the charging efficiency is improved, energy consumption is reduced, and heat generation is improved.

[0033] It should be noted that, referring to Figure 5 It also includes an interface module 900, which has a fifth interface J5 and a sixth interface J6. The first port of the power management module 300 is a communication port, and the second port of the charging module 200 is also a communication port. The first port of the power management module 300 is connected to the second port of the charging module 200 through the fifth interface J5 and the sixth interface J6, respectively.

[0034] It should be noted that when the device to be charged is in contact with the wireless charging coil 100 for charging, the charging module 200 can establish a communication connection with the device to be charged and obtain the charging power information of the device to be charged. Then, based on the power information of the device to be charged, it can obtain the charging voltage required by the device to be charged. For example, after the charging module 200 establishes a communication connection with the device to be charged and obtains that the charging power of the device to be charged is 25W, it can obtain the charging voltage required by the device to be charged as 19V.

[0035] Furthermore, the first port of the power management module 300 is communicatively connected to the second port of the charging module 200 to receive charging voltage data, such as 19V, transmitted by the charging module 200. Within the power management module 300, the low voltage output by the battery module 400 is regulated through a register, and the charging voltage required by the device to be charged is output to the charging module 200. Subsequently, the charging module 200 outputs the voltage to the wireless charging coil 100 to power the device to be charged.

[0036] Understandably, the charging module 200 can dynamically adjust the output voltage according to the power requirements of the device to be charged, ensuring that the device is charged at the optimal voltage and avoiding low charging efficiency or device damage caused by excessively high or low voltage.

[0037] Preferably, the device to be charged can be a mobile phone, tablet computer or earphone equipped with wireless charging function, without further limitation.

[0038] It should be noted that the power management module 300 also includes several resistors and several capacitors.

[0039] Preferably, the power management module 300 can be a power management chip U2, without further limitations.

[0040] It should be noted that the charging module 200 also includes several resistors and several capacitors.

[0041] Preferably, the charging module 200 can be the charging chip U1, but no further restrictions are imposed here.

[0042] In some embodiments, refer to Figure 4 It also includes a first switch module 600, which includes a first MOSFET chip Q1 and a first capacitor C1. The drain of the first MOSFET chip Q1 is connected to the second port VBUS_1 of the power management module 300, the gate of the first MOSFET chip Q1 is connected to the fourth port VOUT2G of the power management module 300, the source of the first MOSFET chip Q1 is connected to the third port AVIN of the charging module 200 and one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.

[0043] It should be noted that a second interface J2 is provided in the interface module 900, and the source of the first MOS transistor chip Q1 is connected to the third port AVIN of the charging module 200 through the second interface J2.

[0044] Understandably, the source of the first MOSFET chip Q1 is connected to the third port AVIN of the charging module 200 and one end of the first capacitor C1, while the other end of the first capacitor C1 is grounded. The first capacitor C1 provides a stable reference potential for the source of the first MOSFET chip Q1. Specifically, the first capacitor C1 stores a certain amount of charge to form a stable voltage node. When the source voltage of the first MOSFET chip Q1 fluctuates due to external interference or load changes, the first capacitor C1 can compensate for these fluctuations through rapid charging and discharging, thereby maintaining the relative stability of the source potential of the first MOSFET chip Q1.

[0045] Understandably, when the fourth port VOUT2G of the power management module 300 outputs a high level, the gate voltage of the first MOSFET chip Q1 is higher than the source voltage, and the first MOSFET chip Q1 is turned on. The second port VBUS_1 of the power management module 300 can output a boosted charging voltage to the device to be charged through the first MOSFET chip Q1 and supply it to the third port AVIN of the charging module 200. Furthermore, the charging module 200 is connected to the wireless charging coil 100 so that the wireless charging coil 100 outputs the boosted voltage to power the device to be charged.

[0046] Understandably, compared to a solution without a first switch module 600, having a first switch module 600 allows the power management module 300 to monitor the output voltage and current of the battery module 400 in real time. When an abnormality occurs in the voltage or current, the first switch module 600 is quickly disconnected, stopping the power supply to the charging module 200, thereby stopping the wireless charging coil 100 from charging the electronic device, preventing damage to the charging electronic device, and improving safety during the charging process.

[0047] In some embodiments, refer to Figure 1 It also includes a short-circuit protection module 500, which is connected to the battery module 400.

[0048] Understandably, when a short circuit occurs in the battery module 400, the current will increase sharply. The short-circuit module can quickly cut off the circuit to prevent the battery module 400 from being damaged due to overcurrent.

[0049] In some embodiments, the system further includes a main control module and a display module. The main control module is connected to the power management module 300 and the display module, respectively. The main control module is connected to the power management module 300 to obtain the output power, voltage, current information or battery power information of the power management module 300. The main control module is connected to the display module to display the output power, voltage, current information or battery power information of the circuit, so that users can intuitively understand the working status of the charging circuit and improve the user experience.

[0050] In some embodiments, refer to Figure 4 It also includes a first charging interface module 700, which includes an interface chip U3, a first voltage regulator circuit 710, a first filter circuit 720, and a second MOSFET chip Q2. The first port VBUS of the interface chip U3 is connected to the first terminal of the first voltage regulator circuit 710 and the first terminal of the first filter circuit 720, respectively. The second terminals of the first voltage regulator circuit 710 and the first filter circuit 720 are both grounded. The third terminal of the first filter circuit 720 is connected to the source of the second MOSFET chip Q2. The gate of the second MOSFET chip Q2 is connected to the fifth port VBUSG of the power management module 300, and the drain of the second MOSFET chip Q2 is connected to the second port VBUS_1 of the power management module 300.

[0051] Understandably, the second terminal of the first filter circuit 720 is grounded, and the third terminal of the first filter circuit 720 is connected to the source of the second MOS transistor chip Q2. The first filter circuit 720 can ensure that the source level of the first MOS transistor chip Q1 is pulled up and maintained at the reference level, which helps to improve the stability of the control of the second MOS transistor chip Q2.

[0052] Understandably, during the charging process between the device to be charged and the first charging interface module 700, when the fifth port BVBUSG of the power management module 300 outputs a high level, the gate voltage of the second MOS transistor chip Q2 is higher than the source voltage, the second MOS transistor chip Q2 is turned on, and the second port VBUS_1 of the power management module 300 can output the boosted voltage to the device to be charged through the second MOS transistor chip Q2.

[0053] Understandably, the first voltage regulator circuit 710 can ensure that the output voltage is stable at the set value, avoiding output voltage instability caused by input voltage fluctuations or load changes, thereby protecting the device to be charged from voltage fluctuations. In addition, a current feedback circuit can be set in the first voltage regulator circuit 710 so that the first voltage regulator circuit 710 can also provide a constant current during charging or discharging, ensuring safe charging of electronic devices or battery modules 400 and preventing overcurrent damage.

[0054] Understandably, the first filter circuit 720 can filter out high-frequency noise and interference signals in the circuit, ensuring the purity of the output voltage and current and avoiding interference to connected devices.

[0055] Furthermore, through the synergistic effect of the first voltage regulator circuit 710 and the first filter circuit 720, the power output of the power management module 300 is ensured to be stable, clean, and efficient, thereby improving the user experience and the safety performance of electronic devices.

[0056] Understandably, compared to the existing wired interface module 900 which can only support 20W input power and 30W output power, the first charging interface module 700 can support a maximum input power of 30W and a maximum output power of 45W through the coordinated action of the first charging interface module 700, the power management module 300, and the battery module 400. This not only improves the energy storage efficiency of the battery module 400 in the charging circuit but also improves the discharge efficiency of the charging circuit for charging electronic devices.

[0057] In some embodiments, the first voltage regulator circuit 710 includes a second capacitor C2 and a first bidirectional Zener diode Z1. One end of the second capacitor C2 serves as the first end of the first voltage regulator circuit 710 and is connected to the first port VBUS of the interface chip U3 and the first end of the first filter circuit 720, respectively. The other end of the second capacitor C2 serves as the second end of the first voltage regulator circuit 710 and is grounded. The second capacitor C2 is connected in parallel with the first bidirectional Zener diode Z1.

[0058] Understandably, the first bidirectional Zener diode Z1 can conduct when the voltage exceeds its rated value, clamping the voltage within a safe range and preventing subsequent circuits from being damaged by overvoltage.

[0059] It is understandable that the second capacitor C2 can store electrical energy and release it when the input voltage fluctuates instantaneously, thus smoothing the output voltage and reducing voltage fluctuations.

[0060] Furthermore, by combining the first bidirectional Zener diode Z1 and the second capacitor C2, the performance of the first voltage regulator circuit 710 can be effectively improved, ensuring that the voltage output by the power management module 300 is stable, clean, and safe.

[0061] In some embodiments, the first filter circuit 720 includes a first resistor R1 and a third capacitor C3. One end of the first resistor R1 serves as the first terminal of the first filter circuit 720 and is connected to the first terminal of the first voltage regulator circuit 710 and the first port VBUS of the interface chip U3. The other end of the first resistor R1 serves as the third terminal of the first filter circuit 720 and is connected to one end of the third capacitor C3 and the source of the second MOS transistor chip Q2. The other end of the third capacitor C3 serves as the second terminal of the first filter circuit 720 and is grounded.

[0062] Understandably, the coordinated action of the first resistor R1 and the third capacitor C3 can filter out high-frequency noise and interference signals in the circuit, ensuring the purity of the output voltage and current and avoiding interference to connected devices. In addition, one end of the third capacitor C3 is connected to the source of the second MOSFET chip Q2, and the other end of the third capacitor C3 is grounded. The third capacitor C3 can ensure that the source level of the second MOSFET chip Q2 is maintained at the reference level, which helps to improve the stability of the control of the second MOSFET chip Q2.

[0063] In some embodiments, the second port A5 of the interface chip U3 is connected to the sixth port CC1 of the power management module 300, the third port B5 of the interface chip U3 is connected to the seventh port CC2 of the power management module 300, the fourth port A8 of the interface chip U3 is connected to the fourth port WX_USB_DM of the charging module 200, and the fifth port B8 of the interface chip U3 is connected to the fifth port WX_USB_DP of the charging module 200.

[0064] It should be noted that the second port A5, the third port B5, the fourth port A8, and the fifth port B8 of the interface chip U3 are all debugging interfaces in the interface chip U3; the sixth port CC1 and the seventh port CC2 of the power management module 300 are both debugging interfaces in the power management module 300; the fourth port WX_USB_DM and the fifth port WX_USB_DP of the charging module 200 are both debugging interfaces in the charging module 200. By connecting the debugging interfaces of the interface chip U3 to the debugging interfaces of the power management module 300 and the charging module 200 respectively, online upgrades of the power management module 300 and the charging module 200 can be achieved. This not only supports repeated online programming of the finished product, shortening the development cycle, but also avoids scrap and waste caused by disassembly and rework, thereby improving production efficiency and resource utilization.

[0065] It should be noted that the interface module 900 is equipped with a third interface J3 and a fourth interface J4. The fourth port A8 of the interface chip U3 is connected to the fourth port WX_USB_DM of the charging module 200 through the third interface J3, and the fifth port B8 of the interface chip U3 is connected to the fifth port WX_USB_DP of the charging module 200 through the fourth interface J4.

[0066] In some embodiments, refer to Figure 4It also includes a second charging interface module 800, which includes a second voltage regulator circuit 810, a second filter circuit 820, and a third MOSFET chip Q3. The sixth port UART1 of the charging module 200 is connected to the first terminal of the second voltage regulator circuit 810 and the first terminal of the second filter circuit 820, respectively. The second terminals of the second voltage regulator circuit 810 and the second terminal of the second filter circuit 820 are both grounded. The third terminal of the second filter circuit 820 is connected to the source of the third MOSFET chip Q3. The gate of the third MOSFET chip Q3 is connected to the eighth port VING of the power management module 300. The drain of the third MOSFET chip Q3 is connected to the second port VBUS_1 of the power management module 300.

[0067] It should be noted that, referring to Figure 5 The interface module 900 is also provided with a first interface J1, and the first end of the second voltage regulator circuit 810 is connected to the sixth port UART1 of the charging module 200 through the first interface J1.

[0068] Understandably, the second terminal of the second filter circuit 820 is grounded, and the third terminal of the second filter circuit 820 is connected to the source of the third MOS transistor chip. The second filter circuit 820 can ensure that the level of the source of the third MOS transistor chip is pulled up and maintained at the reference level, which helps to improve the stability of the control of the third MOS transistor chip.

[0069] Understandably, during the charging process between the device to be charged and the second charging interface module 800, when the eighth port VING of the power management module 300 outputs a high level, the gate voltage of the third MOS transistor chip is higher than the source voltage, the third MOS transistor chip is turned on, and the second port VBUS_1 of the power management module 300 can output the boosted voltage to the device to be charged through the third MOS transistor chip.

[0070] Understandably, the second voltage regulator circuit 810 can ensure that the output voltage is stable at the set value, avoiding output voltage instability caused by input voltage fluctuations or load changes, thereby protecting the device to be charged from the effects of voltage fluctuations.

[0071] Understandably, the second filter circuit 820 can filter out high-frequency noise and interference signals in the circuit, ensuring the purity of the output voltage and current and avoiding interference to connected devices.

[0072] Furthermore, through the synergistic effect of the second voltage regulator circuit 810 and the second filter circuit 820, the power output of the power management module 300 is ensured to be stable, clean, and efficient, thereby improving the user experience and the safety performance of electronic devices.

[0073] Understandably, compared to the existing wired interface module 900 which can only support 20W input power and 30W output power, the second charging interface module 800 can support a maximum input power of 30W and a maximum output power of 45W through the coordinated action of the second charging interface module 800, the power management module 300, and the battery module 400. This not only improves the energy storage efficiency of the battery module 400 in the charging circuit but also improves the discharge efficiency of the charging circuit for charging electronic devices.

[0074] In some embodiments, the second voltage regulator circuit 810 includes a fourth capacitor C4 and a second bidirectional Zener diode Z2. One end of the fourth capacitor C4 serves as the first end of the second voltage regulator circuit 810 and is connected to the sixth terminal UART1 of the charging module 200 and the first end of the second filter circuit 820, respectively. The other end of the fourth capacitor C4 serves as the second end of the second voltage regulator circuit 810 and is grounded. The fourth capacitor C4 is connected in parallel with the second bidirectional Zener diode Z2.

[0075] Understandably, the second bidirectional Zener diode Z2 can conduct when the voltage exceeds its rated value, clamping the voltage within a safe range and preventing subsequent circuits from being damaged by overvoltage.

[0076] Understandably, the fourth capacitor C4 can store electrical energy and release it when the input voltage fluctuates instantaneously, thus smoothing the output voltage and reducing voltage fluctuations.

[0077] Furthermore, through the coordinated action of the second bidirectional Zener diode Z2 and the fourth capacitor C4, the performance of the second voltage regulator circuit 810 can be effectively improved, ensuring that the voltage output by the power management module 300 is stable, clean, and safe.

[0078] In some embodiments, the second filter circuit 820 includes a second resistor R2 and a fifth capacitor C5. One end of the second resistor R2 serves as the first end of the second filter circuit 820 and is connected to the sixth terminal UART1 of the charging module 200 and the first terminal of the second stabilizing circuit, respectively. The other end of the second resistor R2 serves as the third end of the second filter circuit 820 and is connected to one end of the fifth capacitor C5 and the source of the third MOS transistor chip, respectively. The other end of the fifth capacitor C5 serves as the second end of the second filter circuit 820 and is grounded.

[0079] Understandably, the coordinated action of the second resistor R2 and the fifth capacitor C5 can filter out high-frequency noise and interference signals in the circuit, ensuring the purity of the output voltage and current and avoiding interference to connected devices. In addition, one end of the fifth capacitor C5 is connected to the source of the third MOSFET chip, and the other end of the fifth capacitor C5 is grounded. The fifth capacitor C5 can ensure that the source level of the third MOSFET chip is maintained at the reference level, which helps to improve the stability of the control of the third MOSFET chip.

[0080] Secondly, embodiments of this application provide a mobile power supply device, including: a housing and a charging circuit as described in any of the embodiments of the first aspect, wherein the charging circuit is disposed within the housing.

[0081] It should be noted that, compared to the design of a two-stage boost management circuit, the charging circuit can directly adjust the low voltage output by the battery module 400 to the charging voltage required by the device being charged through the power management module 300. On the one hand, this not only improves the boost efficiency but also saves one power management circuit, making the overall circuit more compact and reducing the overall size of the power bank, making it more convenient for users to carry. On the other hand, it improves the charging efficiency of the power bank, reduces energy consumption, and effectively improves heat dissipation, thus enhancing the user experience.

[0082] In some embodiments, the device further includes a heat sink and heat insulation cotton. The battery module 400 in the charging circuit is disposed below the wireless charging coil 100 in the charging circuit. The heat sink is disposed between the wireless charging coil 100 and the battery module 400 by stamping. The heat insulation cotton is disposed between the heat sink and the battery module 400.

[0083] Understandably, the heat sink is stamped between the wireless charging coil 100 and the battery module 400. The heat sink can effectively reduce the temperature of the battery module 400 and the wireless charging coil 100, preventing safety hazards such as battery swelling, leakage, or even fire caused by overheating. In addition, the heat insulation cotton is placed between the heat sink and the battery module 400. The heat insulation cotton has a low thermal conductivity, which can effectively reduce the transfer of heat from the heat sink to the battery module 400. Furthermore, the heat insulation cotton has a certain degree of elasticity and softness, which can play a role in shock absorption and cushioning between the battery module 400 and the heat sink.

[0084] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A charging circuit, characterized by, include: A wireless charging coil, wherein the wireless charging coil is used to supply power to the device to be charged; A charging module, wherein the first port of the charging module is connected to the wireless charging coil, and the charging module is used to communicate with the device to be charged and obtain the charging voltage required by the device to be charged; A power management module, wherein a first port of the power management module is communicatively connected to a second port of the charging module, and the second port of the power management module is connected to a third port of the charging module; A battery module, wherein the battery module is connected to the power management module; Wherein: the power management module is used to boost the output voltage of the battery module according to the charging voltage.

2. The charging circuit of claim 1, wherein, It also includes a first switching module, which includes a first MOSFET chip and a first capacitor. The drain of the first MOSFET chip is connected to the second port of the power management module, the gate of the first MOSFET chip is connected to the fourth port of the power management module, the source of the first MOSFET chip is connected to the third port of the charging module and one end of the first capacitor, and the other end of the first capacitor is grounded.

3. The charging circuit of claim 1, wherein, It also includes a short-circuit protection module, which is connected to the battery module.

4. The charging circuit of claim 1, wherein, It also includes a first charging interface module, which includes an interface chip, a first voltage regulator circuit, a first filter circuit, and a second MOSFET chip. The first port of the interface chip is connected to the first terminal of the first voltage regulator circuit and the first terminal of the first filter circuit, respectively. The second terminals of the first voltage regulator circuit and the first filter circuit are both grounded. The third terminal of the first filter circuit is connected to the source of the second MOSFET chip. The gate of the second MOSFET chip is connected to the fifth port of the power management module, and the drain of the second MOSFET chip is connected to the second port of the power management module.

5. The charging circuit of claim 4, wherein, The first voltage regulator circuit includes a second capacitor and a first bidirectional Zener diode. One end of the second capacitor serves as the first terminal of the first voltage regulator circuit and is connected to the first port of the interface chip and the first terminal of the first filter circuit. The other end of the second capacitor serves as the second terminal of the first voltage regulator circuit and is grounded. The second capacitor is connected in parallel with the first bidirectional Zener diode.

6. The charging circuit of claim 4, wherein, The first filter circuit includes a first resistor and a third capacitor. One end of the first resistor serves as the first terminal of the first filter circuit and is connected to the first port of the interface chip and the first terminal of the first voltage regulator circuit. The other end of the first resistor serves as the third terminal of the first filter circuit and is connected to one end of the third capacitor and the source of the second MOS transistor chip. The other end of the third capacitor serves as the second terminal of the first filter circuit and is grounded.

7. The charging circuit of claim 4, wherein, The second port of the interface chip is connected to the sixth port of the power management module, the third port of the interface chip is connected to the seventh port of the power management module, the fourth port of the interface chip is connected to the fourth port of the charging module, and the fifth port of the interface chip is connected to the fifth port of the charging module.

8. The charging circuit of claim 1, wherein, It also includes a second charging interface module, which includes a second voltage regulator circuit, a second filter circuit, and a third MOSFET chip. The sixth port of the charging module is connected to the first terminal of the second voltage regulator circuit and the first terminal of the second filter circuit, respectively. The second terminal of the second voltage regulator circuit and the second terminal of the second filter circuit are both grounded. The third terminal of the second filter circuit is connected to the source of the third MOSFET chip. The gate of the third MOSFET chip is connected to the eighth port of the power management module, and the drain of the third MOSFET chip is connected to the second port of the power management module.

9. A mobile power supply device, characterized by comprising: include: The housing and the charging circuit as described in any one of claims 1-8, wherein the charging circuit is disposed within the housing.

10. The mobile power source device of claim 9, wherein, It also includes a heat sink and heat insulation cotton. The battery module in the charging circuit is located below the wireless charging coil in the charging circuit. The heat sink is set between the wireless charging coil and the battery module by stamping. The heat insulation cotton is set between the heat sink and the battery module.

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