A charger with software upgrade function and charger

Abstract

The present invention relates to a charger and a charger with a software upgrade function. The input end of the first auxiliary power supply circuit in the charger is connected to the charger output interface, the output end of the first auxiliary power supply circuit is respectively connected to the main control circuit and the communication module, and the main control circuit is connected to the output end of the communication module; the first auxiliary power supply circuit is used to connect the battery through the charger output interface, and the battery power is converted to power the main control circuit and the communication module; the input end of the communication module is used to receive upgrade data, and transmit the upgrade data to the main control circuit, and the main control circuit executes the upgrade data to complete the software upgrade. The present invention uses a battery to reversely power the charger, and the software upgrade can be performed without the charger being plugged into a power supply, ensuring that the charger completes the software upgrade in time to adapt to more application scenarios.

Description

Technical Field

[0001] The present invention relates to the field of chargers, and more particularly to a charger with a software upgrade function and a charger. Background Art

[0002] With the rapid development of the battery industry, charger products are becoming more and more common. In order to match the requirements of battery characteristics and improve charging reliability, chargers generally have built-in software. When upgrading the software of a charger in the prior art, the charger usually needs to be powered on, that is, the charger needs to be plugged into the power supply, and needs to be equipped with a communication line for upgrading, which is very inconvenient. For example, when the charger has been installed in the vehicle system, or in other occasions where it is inconvenient to power on, it will be impossible to update the charger software. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a charger with software upgrade function and a charger for the above-mentioned defects of the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is: construct a charger with software upgrade function, including a main control circuit, a charger input interface, a charger output interface and a power conversion circuit, the main control circuit is connected to the power conversion circuit, the input end of the power conversion circuit is connected to the charger input interface, and the output end of the power conversion circuit is connected to the charger output interface; the charger input interface is used to connect to a power supply, the power conversion circuit is used to convert input voltage and current, and the converted voltage and current are output to the charger output interface, and the charger output interface is used to connect to a battery to charge the battery; the charger also includes a first auxiliary power supply circuit and a communication module;

[0005] The input end of the first auxiliary power supply circuit is connected to the charger output interface, the output end of the first auxiliary power supply circuit is respectively connected to the main control circuit and the communication module, and the main control circuit is connected to the output end of the communication module; the first auxiliary power supply circuit is used to connect to the battery through the charger output interface, and convert the battery power to power the main control circuit and the communication module; the input end of the communication module is used to receive upgrade data and transmit the upgrade data to the main control circuit, and the main control circuit executes the upgrade data to complete the software upgrade.

[0006] Furthermore, in the charger with software upgrade function described in the present invention, the charger also includes a second auxiliary power supply circuit, the input end of the second auxiliary power supply circuit is connected to the charger input interface, and the output end of the second auxiliary power supply circuit is respectively connected to the main control circuit and the communication module; the second auxiliary power supply circuit is used to convert the input voltage and current to power the main control circuit and the communication module.

[0007] Further, in the charger with software upgrade function described in the present invention, when voltage and current are connected to the charger input interface, the first auxiliary power supply circuit does not work, and the second auxiliary power supply circuit works;

[0008] When there is no voltage or current connected to the charger input interface, the first auxiliary power supply circuit works and the second auxiliary power supply circuit does not work.

[0009] Furthermore, in the charger with software upgrade function described in the present invention, the communication module is a USB module, and the USB module includes a USB interface.

[0010] Furthermore, in the charger with software upgrade function described in the present invention, the communication module is a wireless communication module.

[0011] Further, in the charger with software upgrade function described in the present invention, the first auxiliary power supply circuit includes a control chip, a chip power supply circuit, a current sampling circuit, a switch control circuit, an output rectifier filter circuit, an absorption circuit and a power transformer T2;

[0012] The control chip is respectively connected to the charger input interface, the chip power supply circuit, the current sampling circuit and the switch control circuit, the current sampling circuit is connected to the switch control circuit, and the switch control circuit is connected to the primary first output end of the power transformer T2; the chip power supply circuit is connected to the primary second output end of the power transformer T2; the primary input end of the power transformer T2 is connected to the charger input interface, and the primary input end of the power transformer T2 is connected to the primary first output end of the power transformer T2 through the absorption circuit; the output rectifier and filter circuit is connected to the secondary output end of the power transformer T2.

[0013] Further, in the charger with software upgrade function described in the present invention, the chip power supply circuit includes a diode D27, a capacitor C70, an electrolytic capacitor EC9 and a resistor R105;

[0014] The positive electrode of the diode D27 is connected to the second output terminal of the primary side of the power transformer T2, and the negative electrode of the diode D27 is connected to the pin 4 of the control chip through the resistor R105; the negative electrode of the diode D27 is grounded through the capacitor C70, and the negative electrode of the diode D27 is grounded through the electrolytic capacitor EC9.

[0015] Further, in the charger with software upgrade function described in the present invention, the current sampling circuit includes a resistor R114 and a resistor R119;

[0016] The first end of the resistor R114 is connected to the pin 1 of the control chip, the second end of the resistor R114 is connected to the first end of the resistor R119, the first end of the resistor R119 is connected to the switch control circuit, and the second end of the resistor R119 is grounded.

[0017] Further, in the charger with software upgrade function described in the present invention, the switch control circuit includes a MOS tube Q7, a resistor R110, a resistor R111, a resistor R112 and a diode D28;

[0018] The cathode of the diode D28 is connected to the pin 8 of the control chip, the cathode of the diode D28 is connected to the gate of the MOS tube Q7 through the resistor R111, the anode of the diode D28 is connected to the gate of the MOS tube Q7 through the resistor R110, the gate of the MOS tube Q7 is connected to the source of the MOS tube Q7 through the resistor R112, the source of the MOS tube Q7 is connected to the first end of the resistor R119, and the drain of the MOS tube Q7 is connected to the primary first output end of the power transformer T2.

[0019] Further, in the charger with software upgrade function described in the present invention, the output rectification and filtering circuit includes a diode D19, a resistor R87, a capacitor C59 and an electrolytic capacitor EC7;

[0020] The positive electrode of the diode D19 is connected to the first output terminal of the secondary side of the power transformer T2, the positive electrode of the diode D19 is connected to the first end of the capacitor C59 through the resistor R87, the second end of the capacitor C59 is connected to the negative electrode of the diode D19, and the negative electrode of the diode D19 is connected to the second output terminal of the secondary side of the power transformer T2 through the electrolytic capacitor EC7.

[0021] Further, in the charger with software upgrade function described in the present invention, the absorption circuit includes a diode D25, a resistor R84, a resistor R90 and a capacitor C60;

[0022] The positive electrode of the diode D25 is connected to the primary first output terminal of the power transformer T2, and the negative electrode of the diode D25 is connected to the primary input terminal of the power transformer T2 through the capacitor C60; the negative electrode of the diode D25 is connected to the first end of the resistor R84 through the resistor R90, and the second end of the resistor R84 is connected to the primary input terminal of the power transformer T2.

[0023] Furthermore, in the charger with software upgrade function described in the present invention, the model of the control chip is LM3481.

[0024] In addition, the present invention further provides a charger, comprising a first auxiliary power supply circuit;

[0025] The input end of the first auxiliary power supply circuit is connected to the charger output interface of the charger, and the charger output interface is used to connect the battery; the first auxiliary power supply circuit is used to convert the battery power to power the internal equipment of the charger.

[0026] A charger and a charger with a software upgrade function implementing the present invention have the following beneficial effects: the present invention uses a battery to reversely power the charger, and the software upgrade can be performed without the charger being plugged into a power supply, ensuring that the charger completes the software upgrade in a timely manner to adapt to more application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0028] Figure 1 is a schematic diagram of the structure of a charger with a software upgrade function provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the structure of a charger with a software upgrade function provided by an embodiment of the present invention;

[0030] Figure 3 is a circuit diagram of a first auxiliary power supply circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0032] In a preferred embodiment, reference Figure 1The charger with software upgrade function of this embodiment includes a main control circuit 10, a charger input interface 20, a charger output interface 30 and a power conversion circuit 40. The main control circuit 10 is connected to the power conversion circuit 40, the input end of the power conversion circuit 40 is connected to the charger input interface 20, and the output end of the power conversion circuit 40 is connected to the charger output interface 30. The charger input interface 20 is used to connect to the power supply, the power conversion circuit 40 is used to convert the input voltage and current, and the converted voltage and current are output to the charger output interface 30, and the charger output interface 30 is used to connect to the battery to charge the battery. The circuit structure of the main control circuit 10, the charger input interface 20, the charger output interface 30 and the power conversion circuit 40 can refer to the existing technology, and will not be repeated in this embodiment.

[0033] Furthermore, the charger of this embodiment further includes a first auxiliary power supply circuit 50 and a communication module 60. The input end of the first auxiliary power supply circuit 50 is connected to the charger output interface 30, and the output end of the first auxiliary power supply circuit 50 is respectively connected to the main control circuit 10 and the communication module 60, and the main control circuit 10 is connected to the output end of the communication module 60. The first auxiliary power supply circuit 50 is used to connect to the battery through the charger output interface 30, and convert the battery power to power the main control circuit 10 and the communication module 60. The input end of the communication module 60 is used to receive the upgrade data and transmit the upgrade data to the main control circuit 10, and the main control circuit 10 executes the upgrade data to complete the software upgrade.

[0034] This embodiment uses the battery to reversely power the charger, and the software upgrade can be performed without the charger being plugged into a power supply, thereby ensuring that the charger completes the software upgrade in a timely manner to adapt to more application scenarios.

[0035] In some embodiments of the charger with software upgrade function, reference Figure 2 The charger of this embodiment also includes a second auxiliary power supply circuit 70, the input end of the second auxiliary power supply circuit 70 is connected to the charger input interface 20, and the output end of the second auxiliary power supply circuit 70 is connected to the main control circuit 10 through the first auxiliary power supply circuit 50 or the communication module 60. The second auxiliary power supply circuit 70 is used to convert the input voltage and current to power the main control circuit 10 and the communication module 60. The input end of the communication module 60 is used to receive upgrade data and transmit the upgrade data to the main control circuit 10, and the main control circuit 10 executes the upgrade data to complete the software upgrade. In this embodiment, it is allowed to reversely power the charger through the battery, and it is also allowed to directly power the charger from the power supply, so that the charger has two power supply modes, ensuring that the charger completes the software upgrade in time to adapt to more application scenarios.

[0036] In some embodiments of the charger with software upgrade function, it is monitored whether the charger input interface 20 is connected to voltage and current. If the charger input interface 20 is connected to voltage and current, that is, the charger input interface 20 is connected to the power supply, the first auxiliary power supply circuit 50 does not work, the second auxiliary power supply circuit 70 works, and the second auxiliary power supply circuit 70 supplies power to the main control circuit 10 and the communication module 60. If the charger input interface 20 is not connected to voltage and current, that is, the charger input interface 20 is not connected to the power supply, the first auxiliary power supply circuit 50 works, the second auxiliary power supply circuit 70 does not work, and the first auxiliary power supply circuit 50 supplies power to the main control circuit 10 and the communication module 60. In this embodiment, when the charger input interface 20 is connected to voltage and current, the second auxiliary power supply circuit 70 is used for power supply first, so that the battery does not need to release power, and the battery power is kept stable.

[0037] In some embodiments of the charger with software upgrade function, the communication module 60 is a USB module, and the USB module includes a USB interface, which is used to connect an external storage device, such as a USB flash drive, and the external storage device has a USB interface that matches the USB module. The external storage device stores upgrade data, and after the USB module establishes a communication connection with the external storage device, it reads the upgrade data stored in the external storage device, and transmits the upgrade data to the main control circuit 10, and the main control circuit 10 executes the upgrade data to complete the software upgrade. This embodiment only requires an external storage device to complete the software upgrade of the charger, and the operation is simple and low in cost.

[0038] In some embodiments of the charger with software upgrade function, the communication module 60 is a wireless communication module, which is used to establish a communication connection with an external intelligent terminal, such as a smart phone, and the external intelligent terminal has a wireless communication module that matches the communication module 60. The external intelligent terminal stores the upgrade data. After the communication module 60 establishes a wireless communication connection with the external intelligent terminal, it reads the upgrade data stored in the external intelligent terminal (or the external intelligent terminal sends the upgrade data to the communication module 60), and transmits the upgrade data to the main control circuit 10, and the main control circuit 10 executes the upgrade data to complete the software upgrade. As an option, the wireless communication module can select a Bluetooth module, a wifi module, a 3G wireless communication module, a 4G wireless communication module, and a 5G wireless communication module. This embodiment transmits the upgrade data wirelessly, so that the charger does not need to set a hardware interface, thereby improving the aesthetics of the charger.

[0039] In some embodiments of the charger with software upgrade function, reference Figure 3The first auxiliary power supply circuit 50 includes a control chip 501, a chip power supply circuit 502, a current sampling circuit 503, a switch control circuit 504, an output rectifier filter circuit 505, an absorption circuit 506 and a power transformer T2. The control chip 501 is respectively connected to the charger input interface 20 (i.e., connected to the battery, BAT+ in the figure), the chip power supply circuit 502, the current sampling circuit 503 and the switch control circuit 504. The current sampling circuit 503 is connected to the switch control circuit 504, and the switch control circuit 504 is connected to the primary first output terminal of the power transformer T2. The chip power supply circuit 502 is connected to the primary second output terminal of the power transformer T2. The primary input terminal of the power transformer T2 is connected to the charger input interface 20 (i.e., connected to the battery, BAT+ in the figure), and the primary input terminal of the power transformer T2 is connected to the primary first output terminal of the power transformer T2 through the absorption circuit 506. The output rectifier and filter circuit 505 is connected to the secondary output terminal of the power transformer T2, and the output terminals of the output rectifier and filter circuit 505 are respectively connected to the main control circuit 10 and the communication module 60 to supply power to the main control circuit 10 and the communication module 60. Among them, the primary port 1 of the power transformer T2 is the primary input terminal, the primary port 3 of the power transformer T2 is the primary first output terminal, the primary port of the power transformer T2 is grounded, and the primary port 5 of the power transformer T2 is the primary second output terminal. The secondary output terminal includes the secondary first output terminal and the secondary second output terminal, the secondary port 10 of the power transformer T2 is the secondary first output terminal, and the secondary port 9 of the power transformer T2 is the secondary second output terminal.

[0040] In some embodiments of the charger with software upgrade function, the chip power supply circuit 502 includes a diode D27, a capacitor C70, an electrolytic capacitor EC9 and a resistor R105, the positive electrode of the diode D27 is connected to the primary second output terminal of the power transformer T2, and the negative electrode of the diode D27 is connected to the pin 4 of the control chip 501 through the resistor R105. The negative electrode of the diode D27 is grounded through the capacitor C70, and the negative electrode of the diode D27 is grounded through the electrolytic capacitor EC9.

[0041] In some embodiments of the charger with software upgrade function, the current sampling circuit 503 includes a resistor R114 and a resistor R119, the first end of the resistor R114 is connected to pin 1 of the control chip 501, the second end of the resistor R114 is connected to the first end of the resistor R119, the first end of the resistor R119 is connected to the switch control circuit 504, and the second end of the resistor R119 is grounded.

[0042] In some embodiments of the charger with software upgrade function, the switch control circuit 504 includes a MOS tube Q7, a resistor R110, a resistor R111, a resistor R112 and a diode D28, the cathode of the diode D28 is connected to the pin 8 of the control chip 501, the cathode of the diode D28 is connected to the gate of the MOS tube Q7 through the resistor R111, the anode of the diode D28 is connected to the gate of the MOS tube Q7 through the resistor R110, the gate of the MOS tube Q7 is connected to the source of the MOS tube Q7 through the resistor R112, the source of the MOS tube Q7 is connected to the first end of the resistor R119, and the drain of the MOS tube Q7 is connected to the primary first output end of the power transformer T2.

[0043] In some embodiments of the charger with software upgrade function, the output rectifier and filter circuit 505 includes a diode D19, a resistor R87, a capacitor C59 and an electrolytic capacitor EC7, the positive electrode of the diode D19 is connected to the first output terminal of the secondary side of the power transformer T2, the positive electrode of the diode D19 is connected to the first end of the capacitor C59 through the resistor R87, the second end of the capacitor C59 is connected to the cathode of the diode D19, and the cathode of the diode D19 is connected to the second output terminal of the secondary side of the power transformer T2 through the electrolytic capacitor EC7.

[0044] In some embodiments of the charger with software upgrade function, the absorption circuit 506 includes a diode D25, a resistor R84, a resistor R90 and a capacitor C60, the positive electrode of the diode D25 is connected to the primary first output terminal of the power transformer T2, and the negative electrode of the diode D25 is connected to the primary input terminal of the power transformer T2 through the capacitor C60. The negative electrode of the diode D25 is connected to the first end of the resistor R84 through the resistor R90, and the second end of the resistor R84 is connected to the primary input terminal of the power transformer T2. The primary input terminal of the power transformer T2 is grounded through the capacitor C62.

[0045] In the charger with software upgrade function in some embodiments, the model of the control chip 501 is LM3481.

[0046] In some embodiments of the charger with software upgrade function, pin 1 of the control chip 501 is grounded through capacitor C76. Pin 2 of the control chip 501 is connected to the charger input interface 20 (i.e., connected to the battery, BAT+ in the figure) through resistor R97, and pin 2 of the control chip 501 is grounded through resistor R102. Pin 3 of the control chip 501 is connected to the first end of capacitor C73 through resistor R103, and the second end of capacitor C73 is grounded. Pin 4 of the control chip 501 is grounded through resistor R106. Pin 5 of the control chip 501 is grounded. Pin 6 of the control chip 501 is grounded through resistor R88. Pin 7 of the control chip 501 is grounded. Pin 9 of the control chip 501 is grounded through capacitor C77. Pin 10 of the control chip 501 is connected to the charger input interface 20 (i.e., connected to the battery, BAT+ in the figure).

[0047] In a preferred embodiment, the charger of this embodiment includes a first auxiliary power supply circuit 50, the input end of the first auxiliary power supply circuit 50 is connected to the charger output interface 30 of the charger, and the charger output interface 30 is used to connect the battery. The first auxiliary power supply circuit 50 is used to convert the battery power to power the internal devices of the charger, and the power supply of the internal devices of the charger includes some or all internal devices. The circuit structure of the first auxiliary power supply circuit 50 can refer to the above embodiment and will not be repeated here. This embodiment uses the battery to reversely power the charger, solves the problem that there is no power supply to provide power to the charger, and enables the charger to use the battery power to complete the required operation.

[0048] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0049] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0050] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0051] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A charger with a software upgrade function, comprising a main control circuit (10), a charger input interface (20), a charger output interface (30) and a power conversion circuit (40), wherein the main control circuit (10) is connected to the power conversion circuit (40), an input end of the power conversion circuit (40) is connected to the charger input interface (20), and an output end of the power conversion circuit (40) is connected to the charger output interface (30); the charger input interface (20) is used to connect to a power supply, the power conversion circuit (40) is used to convert input voltage and current, and output the converted voltage and current to the charger output interface (30), and the charger output interface (30) is used to connect to a battery to charge the battery; characterized in that: The charger further comprises a first auxiliary power supply circuit (50) and a communication module (60); The input end of the first auxiliary power supply circuit (50) is connected to the charger output interface (30), the output end of the first auxiliary power supply circuit (50) is respectively connected to the main control circuit (10) and the communication module (60), and the main control circuit (10) is connected to the output end of the communication module (60); the first auxiliary power supply circuit (50) is used to connect to a battery via the charger output interface (30) and convert the battery power to supply power to the main control circuit (10) and the communication module (60); the input end of the communication module (60) is used to receive upgrade data and transmit the upgrade data to the main control circuit (10), and the main control circuit (10) executes the upgrade data to complete the software upgrade; The first auxiliary power supply circuit (50) comprises a control chip (501), a chip power supply circuit (502), a current sampling circuit (503), a switch control circuit (504), an output rectification and filtering circuit (505), an absorption circuit (506) and a power transformer T2; The control chip (501) is respectively connected to the charger input interface (20), the chip power supply circuit (502), the current sampling circuit (503) and the switch control circuit (504); the current sampling circuit (503) is connected to the switch control circuit (504); the switch control circuit (504) is connected to the primary first output end of the power transformer T2; the chip power supply circuit (502) is connected to the primary second output end of the power transformer T2; the primary input end of the power transformer T2 is connected to the charger input interface (20); the primary input end of the power transformer T2 is connected to the primary first output end of the power transformer T2 via the absorption circuit (506); and the output rectifier filter circuit (505) is connected to the secondary output end of the power transformer T2.

2. The charger with software upgrade function according to claim 1, characterized in that: The charger further comprises a second auxiliary power supply circuit (70), the input end of the second auxiliary power supply circuit (70) being connected to the charger input interface (20), and the output end of the second auxiliary power supply circuit (70) being connected to the main control circuit (10) via the first auxiliary power supply circuit (50) or the communication module (60); the second auxiliary power supply circuit (70) is used to convert input voltage and current to supply power to the main control circuit (10) and the communication module (60).

3. The charger with software upgrade function according to claim 2, characterized in that: When voltage or current is connected to the charger input interface (20), the first auxiliary power supply circuit (50) does not work, and the second auxiliary power supply circuit (70) works; When no voltage or current is connected to the charger input interface (20), the first auxiliary power supply circuit (50) operates, and the second auxiliary power supply circuit (70) does not operate.

4. The charger with software upgrade function according to claim 1, characterized in that: The communication module (60) is a USB module, and the USB module comprises a USB interface.

5. The charger with software upgrade function according to claim 1, characterized in that: The communication module (60) is a wireless communication module.

6. The charger with software upgrade function according to claim 1, characterized in that: The chip power supply circuit (502) comprises a diode D27, a capacitor C70, an electrolytic capacitor EC9 and a resistor R105; The positive electrode of the diode D27 is connected to the second output terminal of the primary side of the power transformer T2, and the negative electrode of the diode D27 is connected to the pin 4 of the control chip (501) through the resistor R105; the negative electrode of the diode D27 is grounded through the capacitor C70, and the negative electrode of the diode D27 is grounded through the electrolytic capacitor EC9.

7. The charger with software upgrade function according to claim 1, characterized in that: The current sampling circuit (503) comprises a resistor R114 and a resistor R119; The first end of the resistor R114 is connected to pin 1 of the control chip (501), the second end of the resistor R114 is connected to the first end of the resistor R119, the first end of the resistor R119 is connected to the switch control circuit (504), and the second end of the resistor R119 is grounded.

8. The charger with software upgrade function according to claim 7, characterized in that: The switch control circuit (504) comprises a MOS tube Q7, a resistor R110, a resistor R111, a resistor R112 and a diode D28; The cathode of the diode D28 is connected to pin 8 of the control chip (501), the cathode of the diode D28 is connected to the gate of the MOS transistor Q7 via the resistor R111, the anode of the diode D28 is connected to the gate of the MOS transistor Q7 via the resistor R110, the gate of the MOS transistor Q7 is connected to the source of the MOS transistor Q7 via the resistor R112, the source of the MOS transistor Q7 is connected to the first end of the resistor R119, and the drain of the MOS transistor Q7 is connected to the primary first output end of the power transformer T2.

9. The charger with software upgrade function according to claim 1, characterized in that: The output rectification and filtering circuit (505) comprises a diode D19, a resistor R87, a capacitor C59 and an electrolytic capacitor EC7; The positive electrode of the diode D19 is connected to the first output terminal of the secondary side of the power transformer T2, the positive electrode of the diode D19 is connected to the first end of the capacitor C59 through the resistor R87, the second end of the capacitor C59 is connected to the negative electrode of the diode D19, and the negative electrode of the diode D19 is connected to the second output terminal of the secondary side of the power transformer T2 through the electrolytic capacitor EC7.

10. The charger with software upgrade function according to claim 1, characterized in that: The absorption circuit (506) comprises a diode D25, a resistor R84, a resistor R90 and a capacitor C60; The positive electrode of the diode D25 is connected to the primary first output terminal of the power transformer T2, and the negative electrode of the diode D25 is connected to the primary input terminal of the power transformer T2 through the capacitor C60; the negative electrode of the diode D25 is connected to the first end of the resistor R84 through the resistor R90, and the second end of the resistor R84 is connected to the primary input terminal of the power transformer T2.

11. The charger with software upgrade function according to claim 1, characterized in that: The model of the control chip (501) is LM3481.

12. A charger, characterized in that: It comprises a first auxiliary power supply circuit (50); The input end of the first auxiliary power supply circuit (50) is connected to the charger output interface (30) of the charger, and the charger output interface (30) is used to connect a battery; the first auxiliary power supply circuit (50) is used to convert the battery power to supply power to the internal equipment of the charger; The first auxiliary power supply circuit (50) comprises a control chip (501), a chip power supply circuit (502), a current sampling circuit (503), a switch control circuit (504), an output rectification and filtering circuit (505), an absorption circuit (506) and a power transformer T2; The control chip (501) is respectively connected to the charger input interface (20), the chip power supply circuit (502), the current sampling circuit (503) and the switch control circuit (504); the current sampling circuit (503) is connected to the switch control circuit (504); the switch control circuit (504) is connected to the primary first output end of the power transformer T2; the chip power supply circuit (502) is connected to the primary second output end of the power transformer T2; the primary input end of the power transformer T2 is connected to the charger input interface (20); the primary input end of the power transformer T2 is connected to the primary first output end of the power transformer T2 via the absorption circuit (506); and the output rectifier filter circuit (505) is connected to the secondary output end of the power transformer T2.

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