Charging control circuit, charging control method, and charging control system

Abstract

The invention provides a charging control circuit, a charging control method and a charging control system, and the charging control circuit comprises a first secondary winding unit which is electrically connected with a first secondary winding of a transformer and is used for outputting and providing charging electric energy to a battery module; the switching circuit is used for switching on or switching off a power supply line from the first secondary winding unit to the battery module; the output end of the control circuit is electrically connected with the control end of the switching circuit; and the second secondary winding unit is electrically connected with a second secondary winding of the transformer, the output end of the second secondary winding unit is electrically connected with the input end of the control circuit, and the second secondary winding unit is used for providing working voltage for the control circuit. According to the invention, the switching-on and switching-off of the switching circuit are not affected by the power transmission circuit, and the control precision of the switching circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a charging control circuit, a charging control method and a charging control system. Background Art

[0002] At present, new energy vehicles are pollution-free, renewable, and low-emission, meeting the requirements of sustainable development and having good economic prospects. Among them, the battery module is the core module of new energy vehicles, and the design of the charging control circuit for charging the battery module is crucial. The existing battery module charging control circuit mainly uses thyristor control output to charge, but during the charging process, the control signal of the thyristor is easily affected by the interference of the power transmission circuit, resulting in uncertainty in the switching state of the thyristor. Summary of the invention

[0003] The present application provides a charging control circuit, a charging control method and a charging control system, aiming to solve the current technical problem that the control signal of a thyristor is easily interfered by a power transmission circuit.

[0004] In a first aspect, the present application provides a charging control circuit, which is applied to a charging control system. The charging control system includes a PFC circuit, a transformer, and a charging control circuit electrically connected in sequence. The charging control circuit includes:

[0005] A first secondary winding unit, the first secondary winding unit is electrically connected to the first secondary winding of the transformer, and the first secondary winding unit is used to provide charging power to the battery module;

[0006] A switch circuit, the switch circuit is electrically connected to the main line between the output end of the first secondary winding unit and the output end of the charging control circuit, and the switch circuit is used to turn on or off the power supply line from the first secondary winding unit to the battery module;

[0007] A control circuit, wherein an output end of the control circuit is electrically connected to a control end of the switch circuit, and the control circuit is used to output a control signal to the switch circuit;

[0008] A second secondary winding unit, the second secondary winding unit is electrically connected to the second secondary winding of the transformer, the output end of the second secondary winding unit is electrically connected to the input end of the control circuit, and the second secondary winding unit is used to provide an operating voltage to the control circuit.

[0009] In some embodiments, the switch circuit includes a first MOS transistor and a second MOS transistor;

[0010] The first end of the first MOS tube is electrically connected to the output end of the first secondary winding unit, the second end of the first MOS tube is electrically connected to the first end of the second MOS tube, the second end of the second MOS tube is electrically connected to the output end of the charging control circuit, and the control end of the first MOS tube and the control end of the second MOS tube are electrically connected to the output end of the control circuit respectively;

[0011] The parasitic diode of the first MOS tube is arranged in opposite directions to the parasitic diode of the second MOS tube.

[0012] In some embodiments, the control circuit includes a photocoupler;

[0013] The collector of the photoelectric coupler is electrically connected to the second secondary winding unit, and the emitter of the photoelectric coupler is electrically connected to the control end of the switch circuit;

[0014] The anode of the photocoupler is used to receive the control voltage signal, and the cathode terminal of the photocoupler is used to be grounded.

[0015] In some embodiments, the number of turns of the first secondary winding is greater than the number of turns of the second secondary winding.

[0016] In some embodiments, the first secondary winding unit includes a first unidirectional diode, a first resistor, and a first capacitor;

[0017] A first end of the first unidirectional diode is electrically connected to a first end of the first secondary winding of the transformer, a second end of the first unidirectional diode is electrically connected to a first end of the first resistor, and a second end of the first resistor is electrically connected to an input end of the switch circuit;

[0018] The first end of the first capacitor is electrically connected to the second end of the first resistor, and the second end of the first capacitor is electrically connected to the second end of the first secondary winding of the transformer.

[0019] In some embodiments, the first secondary winding unit includes a first unidirectional diode, a first resistor, and a first capacitor;

[0020] A first end of the first unidirectional diode is electrically connected to a first end of the first secondary winding of the transformer, and a second end of the first unidirectional diode is electrically connected to a first end of the first capacitor;

[0021] The first end of the first resistor is electrically connected to the first end of the first unidirectional diode, and the second end of the first resistor is electrically connected to the second end of the first capacitor.

[0022] In some embodiments, the second secondary winding unit includes a second unidirectional diode, a second resistor, and

[0023] A second capacitor;

[0024] A first end of the second unidirectional diode is electrically connected to a first end of the second secondary winding of the transformer, a second end of the second unidirectional diode is electrically connected to a first end of the second resistor, and a second end of the second resistor is electrically connected to an input end of the control circuit;

[0025] The first end of the second capacitor is electrically connected to the second end of the second resistor, and the second end of the second capacitor is electrically connected to the second end of the second secondary winding of the transformer.

[0026] In some embodiments, the charging control circuit further includes a pre-charging switch circuit;

[0027] One end of the pre-charging switch circuit is electrically connected to the first secondary winding unit, and the other end is electrically connected to the output end of the charging control circuit, and the pre-charging switch circuit is connected in parallel with the switch circuit;

[0028] During operation of the charging control circuit, the switching state of the pre-charging switch circuit and the switching state of the switch circuit are mutually exclusive.

[0029] In some embodiments, the pre-charge switch circuit includes a first switch tube;

[0030] A first end of the first switch tube is electrically connected to the first secondary winding unit, and a second end of the first switch tube is electrically connected to the battery module.

[0031] In some embodiments, the pre-charge switch circuit further includes a second switch tube;

[0032] The second end of the second switch tube is electrically connected to the control end of the first switch tube, the first end of the second switch tube is electrically connected to the control end of the second switch tube, and the control end of the second switch tube is used to access the pre-charge control signal.

[0033] In a second aspect, the present application provides a charging control method, which is applied to a processing circuit in a charging control system. The charging control system includes the charging control circuit as described in the first aspect. The charging control method includes:

[0034] Detecting a control parameter of the charging control circuit, the control parameter comprising at least one of a temperature, an output voltage, a charging time, and an output current of the charging control circuit;

[0035] When the control parameter meets the preset condition, a control signal is sent to the control circuit in the charging control circuit, so that the charging control circuit supplies power to the external battery module.

[0036] In some embodiments, the charging control method further includes:

[0037] Detecting a fault signal of the charging control circuit, the fault signal comprising at least one of a short circuit signal or a reverse connection signal of the charging control circuit;

[0038] When a fault signal is present in the charging control circuit, a power-off signal is sent to the control circuit in the charging control circuit, so that the charging control circuit stops supplying power to the external battery module.

[0039] In a third aspect, the present application provides a charging control system, which includes a processing circuit, a PFC circuit and a transformer electrically connected in sequence, and the charging control circuit as described in the first aspect.

[0040] In the embodiment of the present application, the second secondary winding of the transformer provides a control signal to the control end of the switching circuit through the second secondary winding unit to turn on the switching circuit, so that the first secondary winding of the transformer provides charging power to the battery module through the first secondary winding unit. The control circuit and the power transmission circuit of the charging control circuit each use a secondary winding, and the power is driven on and off by an independent secondary winding, so that the on and off of the switching circuit will not be affected by the power transmission circuit, which is beneficial to improving the control accuracy of the switching circuit and avoiding the phenomenon that the switching circuit is affected by the power transmission circuit and causes an unstable switching state. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a module schematic diagram of a charging control circuit provided in an embodiment of the present application;

[0043] Figure 2 is another module schematic diagram of the charging control circuit provided in the embodiment of the present application;

[0044] Figure 3 is another module schematic diagram of the charging control circuit provided in the embodiment of the present application;

[0045] Figure 4 is a circuit diagram of a charging control circuit provided in an embodiment of the present application;

[0046] Figure 5 is another module schematic diagram of the charging control circuit provided in the embodiment of the present application;

[0047] Figure 6 It is a flow chart of a charging control method provided in an embodiment of the present application;

[0048] Figure 7 is another flow chart of the charging control method provided in the embodiment of the present application;

[0049] Figure 8 is another circuit diagram of the charging control circuit provided in the embodiment of the present application.

[0050] Among them, a first secondary winding unit 10, a second secondary winding unit 20, a switch circuit 30, a control circuit 40, a battery module 50, and a pre-charge switch circuit 60;

[0051] FPC circuit 100, transformer 200, charging control circuit 300;

[0052] Charging voltage VBUS, operating voltage Vc, first MOS tube Q201, second MOS tube Q202, photocoupler U203, first secondary winding WD1, second secondary winding WD2, first unidirectional diode D201, first resistor R201, first capacitor C201, second unidirectional diode D202, second resistor R206, second capacitor C224, first switch tube Q205, second switch tube Q206. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0055] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the invention can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0056] The embodiments of the present application provide a charging control circuit, a charging control method and a charging control system, which are described in detail below.

[0057] First, see Figure 1 , Figure 1 A module schematic diagram of a charging control circuit 300 in an embodiment of the present application is shown. The charging control system includes a PFC circuit 100, a transformer 200 and a charging control circuit 300 which are electrically connected in sequence, wherein the charging control circuit 300 includes:

[0058] A first secondary winding unit 10, the first secondary winding unit 10 is electrically connected to the first secondary winding WD1 of the transformer 200, and the first secondary winding unit 10 is used to provide charging power to the battery module 50;

[0059] A switch circuit 30, the switch circuit 30 is electrically connected to the main line between the output end of the first secondary winding unit 10 and the output end of the charging control circuit 300, and the switch circuit 30 is used to turn on or off the power supply line from the first secondary winding unit 10 to the battery module 50;

[0060] A control circuit 40, wherein an output end of the control circuit 40 is electrically connected to a control end of the switch circuit 30, and the control circuit 40 is used to output a control signal to the switch circuit 30;

[0061] The second secondary winding unit 20 is electrically connected to the second secondary winding WD2 of the transformer 200 , and the output end of the second secondary winding unit 20 is electrically connected to the input end of the control circuit 40 . The second secondary winding unit 20 is used to provide a working voltage to the control circuit 40 .

[0062] Specifically, the PFC circuit 100 (Power Factor Correction circuit) can improve the circuit power factor, thereby reducing the circuit power loss input to the transformer 200 and improving the circuit transmission efficiency of the charging control system. Exemplarily, the PFC circuit 100 can be a boost PFC circuit 100 or a buck PFC circuit 100. The PFC circuit 100 can be an active PFC circuit or a passive PFC circuit.

[0063] The transformer 200 can convert the voltage input by the PFC circuit 100 into the voltage required by the corresponding device to adapt to the corresponding electrical equipment (such as a rechargeable battery pack, an electric car, an electric truck or an electric bicycle, etc.). For example, the first secondary winding unit 10 connected to the first secondary winding WD1 of the transformer 200 can provide the charging power required by the battery module 50. For another example, the second secondary winding unit 20 connected to the second secondary winding WD2 of the transformer 200 can provide the working voltage of the control circuit, and then output a control signal to the switch circuit 30. Exemplarily, the transformer 200 can be a core transformer 200, a shell transformer 200, an amorphous alloy transformer, etc. The transformer 200 can also be other types of transformers. The transformer 200 can be an isolation transformer or a non-isolation transformer. This is just an example, and there is no excessive restriction on the type of transformer.

[0064] It can be understood that the charging control system may also include other circuit modules, such as an output filter circuit, a lightning protection circuit, an overcurrent and overvoltage protection circuit, a processing circuit and / or a battery module detection circuit, a feedback output control circuit, a flyback control circuit, a transformer primary switch control circuit, etc. For another example, a filter circuit is provided at the input end of the PFC circuit 100. The first secondary winding unit 10 includes an AC / DC conversion circuit; the AC / DC conversion circuit includes a rectifier circuit, which may be a bridge rectifier circuit, a half-wave rectifier circuit, or a full-wave rectifier circuit; the AC / DC conversion circuit includes a voltage adjustment circuit, which includes a boost circuit and / or a buck circuit. The processing circuit may be a processing circuit composed of an MCU chip, or a processing circuit composed of other processing chips.

[0065] The first secondary winding unit 10 is connected to the first secondary winding WD1 of the transformer 200, and the first secondary winding WD1 is coupled to the primary winding of the transformer 200. The first secondary winding WD1 generates an induced electromotive force to output the electric energy to be converted. The electric energy to be converted provides the charging voltage VBUS to the battery module 50 after passing through the first secondary winding unit 10, thereby charging the battery module. The second secondary winding unit 20 is connected to the second secondary winding WD2 of the transformer 200, and the second secondary winding WD2 is also coupled to the primary winding of the transformer 200. The second secondary winding WD2 generates an induced electromotive force, and the second secondary winding unit 20 converts the induced electromotive force generated by the second secondary winding WD2 into the working voltage Vc of the control circuit, so that the control circuit 40 outputs a control signal for controlling the switch circuit 30.

[0066] In some embodiments of the present application, the first secondary winding WD1 and the second secondary winding WD2 can be coupled to the primary winding of the same transformer, that is, the first secondary winding WD1 and the second secondary winding WD2 belong to the same transformer. In some other embodiments of the present application, the first secondary winding WD1 and the second secondary winding WD2 can be coupled to the primary windings of two transformers, that is, the first secondary winding WD1 and the second secondary winding WD2 belong to different transformers, and the charging power for charging the battery module 50 and the operating voltage of the control circuit are outputted through the secondary windings of the two transformers.

[0067] The switch circuit 30 can control whether the first secondary winding unit 10 provides the charging voltage VBUS to the battery module 50 so that the battery module 50 can be charged. In some embodiments of the present application, the switch circuit 30 may include a switch, one end of which is electrically connected to the output end of the first secondary winding unit 10, and the other end is electrically connected to the positive or negative electrode of the battery module 50. When the switch is disconnected, the loop formed by the first secondary winding WD1 of the transformer 200, the first secondary winding unit 10 and the battery module 50 is disconnected, thereby stopping charging the battery module 50; when the switch is closed, the loop formed by the first secondary winding WD1 of the transformer 200, the first secondary winding unit 10 and the battery module 50 is connected, thereby starting to charge the battery module 50. In some embodiments of the present application, the switching circuit 30 may include multiple switches, for example, multiple switches connected in series. When a certain middle switch, or at least one switch, or all switches are controlled to disconnect the loop formed by the first secondary winding WD1, the first secondary winding unit 10 and the battery module 50, the charging of the battery module 50 can be stopped; when a certain middle switch, or at least one switch, or all switches are controlled to connect the loop formed by the first secondary winding WD1, the first secondary winding unit 10 and the battery module 50, the charging of the battery module 50 can be started.

[0068] Exemplarily, the switch in the switch circuit 30 may be a transistor with a switch function, such as a MOS tube, an IGBT tube or a triode.

[0069] The second secondary winding unit 20 provides an operating voltage to the control circuit 40 , and the control circuit provides a control signal to the control end of the switch circuit 30 according to the driving signal from the processing circuit, so as to indirectly control the switch circuit 30 to open or close.

[0070] In some embodiments of the present application, the control circuit 40 may include one or more switches, and controlling at least one switch causes the control circuit 40 to stop outputting a control signal to the control end of the switch circuit 30, thereby disconnecting the switch circuit 30 and eventually stopping charging the battery module 50; and controlling at least one switch causes the control circuit 40 to provide a control signal to the control end of the switch circuit 30, thereby closing the switch circuit 30 and eventually charging the battery module 50.

[0071] The battery module 50, as a charged object or a discharge object that releases electric energy, is an energy storage and energy release component in the charge and discharge control system, so that the charge and discharge control system can complete the normal energy storage process and energy release process. In some embodiments of the present application, the battery module 50 can be composed of single cells, such as lithium manganese oxide batteries, lithium cobalt oxide batteries, lithium iron phosphate batteries, ternary lithium batteries, lead-acid batteries, nickel-cadmium batteries, nickel-iron batteries, or nickel-hydride batteries.

[0072] In some other embodiments of the present application, the battery module 50 may be composed of a plurality of single cells. For example, a plurality of single cells are connected in series to form a battery module or in parallel to form a battery module or a battery module formed by series-parallel connection.

[0073] In an embodiment of the present application, the present application provides a charging voltage VBUS to the battery module 50 through a first secondary winding unit 10, and provides a control circuit working voltage Vc through a second secondary winding unit 20, so that the control circuit provides a control signal to the control end of the switch circuit 30, so that the control circuit and the power transmission circuit of the charging control circuit 300 each adopt a secondary winding, and the control circuit working voltage is provided through an independent secondary winding, thereby driving the switch circuit 30 to be turned on and off, so that the switch circuit 30 is not affected by the power transmission circuit. The on and off of the switch circuit 30 is beneficial to improve the control accuracy of the switch circuit 30 and avoid the switch circuit 30 being affected by the power transmission circuit and causing the switch state to be unstable.

[0074] In some embodiments of the present application, see Figure 2 , Figure 2Another module schematic diagram of the charging control circuit 300 in the embodiment of the present application is shown, wherein the switch circuit 30 includes a first MOS transistor Q201 and a second MOS transistor Q202; the first end of the first MOS transistor Q201 is electrically connected to the output end of the first secondary winding unit 10, the second end of the first MOS transistor Q201 is electrically connected to the first end of the second MOS transistor Q202, and the second end of the second MOS transistor is electrically connected to the output end of the charging control circuit 300; the control end of the first MOS transistor Q201 and the control end of the second MOS transistor Q202 are respectively electrically connected to the output end of the control circuit; the parasitic diode of the first MOS transistor Q201 and the parasitic diode of the second MOS transistor Q202 are arranged in opposite directions.

[0075] It should be noted that the first pole / first end of each transistor used in the embodiments of the present application is one of the source and the drain, and the second pole / second end of each transistor is the other of the source and the drain. Since the source and drain of the transistor can be symmetrical in structure, the source and drain can be structurally indistinguishable, that is, the first pole / first end and the second pole / second end of the transistor in the embodiments of the present application can be structurally indistinguishable. Exemplarily, in the case where the transistor is a P-type transistor, the first pole / first end of the transistor is the source, and the second pole / second end is the drain; exemplarily, in the case where the transistor is an N-type transistor, the first pole / first end of the transistor is the drain, and the second pole / second end is the source.

[0076] Exemplarily, taking the first MOS tube Q201 and the second MOS tube Q202 as NMOS tubes, the source of the first NMOS tube Q201 is electrically connected to the source of the second NMOS tube Q202; the drain of the first NMOS tube Q201 is electrically connected to the output end of the first secondary winding unit 10, and the drain of the second NMOS tube Q202 is electrically connected to the output end of the charging control circuit 300. Since the NMOS tube has a unidirectional conduction characteristic with the source pointing to the gate, and the source of the first NMOS tube Q201 is electrically connected to the source of the second NMOS tube Q202, the first NMOS tube Q201 and the second NMOS tube Q202 respectively have two parasitic diodes with opposite conduction directions. When the first NMOS tube Q201 and the second NMOS tube Q202 are working, the two parasitic diodes can block currents in two directions, thereby preventing current from flowing back to the charging control circuit 300, thereby avoiding current backflow and damaging the circuit in the charging control system.

[0077] It is understandable that the switch circuit 30 can also use a thyristor transistor to achieve switch control; or, the first MOS transistor Q201 and the second MOS transistor Q202 can also be PMOS transistors, and the sources of the two PMOS are connected to each other to form a switch circuit 30 with two parasitic diodes facing each other.

[0078] In some embodiments of the present application, see Figure 3 , Figure 3 Another module schematic of the charging control circuit 300 in the embodiment of the present application is shown, wherein the control circuit 40 includes a photocoupler U203; the collector of the photocoupler U203 is electrically connected to the second secondary winding unit 20, and the emitter of the photocoupler U203 is electrically connected to the control end of the switching circuit 30; the anode of the photocoupler U203 is used to receive the control voltage signal O / P_MOS_CTRL, and the cathode end of the photocoupler U203 is used for grounding.

[0079] It should be noted that the control voltage signal O / P_MOS_CTRL can be issued by a processing circuit or a single-chip microcomputer constituted by a chip. After the anode of the photocoupler U203 receives the control voltage signal, the photodiode of the photocoupler U203 emits light, so that the emitter and collector of the light receiver are connected. The control circuit 40 is in a closed state at this time, so the second secondary winding unit 20 provides a voltage to the control end of the switch circuit 30, so that the switch circuit 30 is turned on. At the same time, since the photocoupler U203 can isolate the control voltage signal issued by the chip from the voltage signal of the working voltage Vc output by the second secondary winding, the signal between the control voltage signal O / P_MOS_CTRL and the voltage signal of the working voltage Vc is isolated, combined with the embodiment of the control circuit and the power transmission circuit of the charging control circuit 300 of the present application each using a secondary winding isolation, it can effectively prevent the control voltage signal O / P_MOS_CTRL from being interfered by other voltage signals, which is conducive to further improving the control accuracy of the switch circuit 30.

[0080] It is understandable that the control circuit 40 may also use transistors with switching functions such as MOS tubes, IGBT tubes or triodes to achieve switch control.

[0081] In some embodiments of the present application, see Figure 4 , Figure 4 A circuit diagram of the charging control circuit 300 in an embodiment of the present application is shown, wherein the number of turns of the first secondary winding WD1 is greater than the number of turns of the second secondary winding WD2. Specifically, since the number of turns of the first secondary winding WD1 is greater than the number of turns of the second secondary winding WD2, the induced electromotive force of the first secondary winding WD1 will be greater than the induced electromotive force of the second secondary winding WD2, which can reduce the energy consumption of the second secondary winding WD2, the second secondary winding unit and the control circuit, and improve the charging efficiency of the battery module 50.

[0082] In some embodiments of the present application, see Figure 4, wherein the first secondary winding unit 10 includes a first unidirectional diode D201, a first resistor R201 and a first capacitor C201; the first end of the first unidirectional diode D201 is electrically connected to the first end of the first secondary winding WD1 of the transformer 200, the second end of the first unidirectional diode D201 is electrically connected to the first end of the first resistor R201, and the second end of the first resistor R201 is electrically connected to the input end of the switching circuit 30; the first end of the first capacitor C201 is electrically connected to the second end of the first resistor R201, and the second end of the first capacitor C201 is electrically connected to the second end of the first secondary winding WD1. Specifically, the first unidirectional diode D201 can perform half-wave rectification on the AC signal input by the first secondary winding WD1 of the transformer 200, so as to convert the AC signal into a DC signal and provide it to the battery module 50 for charging, while the first resistor R201 and the first capacitor C201 form a resistor-capacitor circuit (RC shaping circuit), which is beneficial to eliminate noise in the DC signal, thereby avoiding the phenomenon of sharp pulse voltage in the charging voltage VBUS received by the battery module 50.

[0083] It can be understood that the first secondary winding unit 10 can also use a bridge rectifier circuit or a full-wave rectifier circuit to replace the first unidirectional diode D201 to convert the AC signal into a DC signal; or the first secondary winding unit 10 can also use a MOS tube rectifier circuit to replace the first unidirectional diode D201 to convert the AC signal into a DC signal.

[0084] In some embodiments of the present application, see Figure 8 , wherein the first secondary winding unit 10 includes a first unidirectional diode D201, a first resistor R201 and a first capacitor C201; the first end of the first unidirectional diode D201 is electrically connected to the first end of the first secondary winding of the transformer, and the second end of the first unidirectional diode D201 is electrically connected to the first end of the first capacitor C201; the first end of the first resistor R201 is electrically connected to the first end of the first unidirectional diode D201, and the second end of the first resistor R201 is electrically connected to the second end of the first capacitor C201. Similarly, the first unidirectional diode D201 can perform half-wave rectification on the AC signal input by the first secondary winding WD1 of the transformer 200. At the same time, when the AC signal input by the first secondary winding WD1 is pulled high, the first secondary winding WD1 charges the first capacitor C201 through the first resistor R201. When the AC signal input by the first secondary winding WD1 is pulled low, the first secondary winding WD1 discharges the first capacitor C201 through the first resistor R201, which is beneficial to convert the AC signal input by the first secondary winding WD1 and obtain a DC signal with a smooth waveform, so as to achieve the purpose of DC charging of the battery module 50.

[0085] It can be understood that the first unidirectional diode D201 can be a single diode. The first unidirectional diode D201 can also be as Figure 8 The configuration shown is to have multiple unidirectional diodes connected in parallel, which can withstand a larger current and act as a shunt while achieving rectification; alternatively, the first resistor R201 can also be configured as multiple resistors connected in parallel (for example, resistors R201, R202, and R203) to provide a greater number of branches to charge / discharge the first capacitor C201.

[0086] In some embodiments of the present application, see Figure 4 , wherein the second secondary winding unit 20 includes a second unidirectional diode D202, a second resistor R206 and a second capacitor C224; the first end of the second unidirectional diode D202 is electrically connected to the first end of the second secondary winding WD2 of the transformer 200, the second end of the second unidirectional diode D02 is electrically connected to the first end of the second resistor R206, and the second end of the second resistor R206 is electrically connected to the input end of the control circuit 40; the first end of the second capacitor C224 is electrically connected to the second end of the second resistor R206, and the second end of the second capacitor C224 is electrically connected to the second end of the second secondary winding WD2. Similarly, the second unidirectional diode D202 can perform half-wave rectification on the AC signal input by the second secondary winding WD2 of the transformer 200, so as to convert the AC signal into a DC signal and provide it to the control circuit 40 for switching control, while the second resistor R206 and the second capacitor C224 form a resistor-capacitor circuit (RC shaping circuit), which is beneficial to eliminating noise in the DC signal and avoiding the instability of the working voltage Vc connected to the control end of the switching circuit 30, which leads to the unstable switching state of the switching circuit 30.

[0087] It can be understood that the second secondary winding unit 20 can also use a bridge rectifier circuit or a full-wave rectifier circuit to replace the second unidirectional diode D202 to convert the AC signal into a DC signal.

[0088] In some embodiments of the present application, see Figure 4 as well as Figure 5 , Figure 5 Another module schematic diagram of the charging control circuit 300 in the embodiment of the present application is shown, wherein the charging control circuit 300 also includes a pre-charging switch circuit 60; one end of the pre-charging switch circuit 60 is electrically connected to the first secondary winding unit 10, and the other end is electrically connected to the output end of the charging control circuit 300, and the pre-charging switch circuit 60 is connected in parallel with the switch circuit 30; during the operation of the charging control circuit 300, the switching state of the pre-charging switch circuit 60 is mutually exclusive with the switching state of the switch circuit 30.

[0089] Specifically, before the switch circuit 30 is closed, the pre-charge switch circuit 60 is turned on so that the charging voltage VBUS is electrically connected to the battery module 50, so as to pre-charge the battery module 50 to activate the battery module 50, and the voltage signal of the battery module 50 can be obtained through the BAT1+ interface to facilitate the determination of whether the voltage of the battery module 50 meets the requirements, and to avoid the phenomenon that the voltage of the battery module 50 is too high or too low. After determining that the voltage of the battery module 50 is qualified and activating the battery module 50, the pre-charge switch circuit 60 can be disconnected, and the switch circuit 30 can be closed to charge the battery module 50 using the charging voltage VBUS.

[0090] In some embodiments of the present application, see Figure 4 The pre-charging switch circuit 60 includes a first switch tube Q205; a first end of the first switch tube Q205 is electrically connected to the first secondary winding unit 10, and a second end of the first switch tube Q205 is electrically connected to the battery module 50. Specifically, when the control end of the first switch tube Q205 receives a voltage signal to close the first switch tube Q205, the first secondary winding unit 10 charges the battery module 50 through the first switch tube Q205, so as to judge whether the voltage of the battery module 50 meets the requirements through the BAT1+ interface.

[0091] As an example, the first switch tube Q205 is a triode, the emitter of the first switch tube Q205 is electrically connected to the first secondary winding unit 10, the collector of the first switch tube Q205 is electrically connected to the battery module 50, and the emitter of the first switch tube Q205 is electrically connected to the base of the first switch tube Q205. Specifically, when the base of the first switch tube Q205 is connected to the signal, the emitter and collector of the first switch tube Q205 are turned on, so that the charging voltage VBUS is connected to the battery module 50 and the battery module 50 is pre-charged. Detection.

[0092] Further, in some embodiments of the present application, continue to refer to Figure 4 The pre-charge switch circuit 60 further includes a second switch tube Q206; the second end of the second switch tube Q206 is electrically connected to the control end of the first switch tube Q205, the first end of the second switch tube Q206 is electrically connected to the control end of the second switch tube Q206, and the control end of the second switch tube Q206 is used to access the pre-charge control signal. Specifically, when the control end of the second switch tube Q206 receives the pre-charge control signal (for example, the BAT-ON signal sent by the chip), the first end of the second switch tube Q206 is connected to the second end, so that the pre-charge control signal is transmitted to the control end of the first switch tube Q205, so that the second switch tube Q206 is used to indirectly control the switch state of the first switch tube Q205.

[0093] As an example, the second switch tube Q206 is a triode, the collector of the second switch tube Q206 is electrically connected to the base of the first switch tube Q205, the emitter of the second switch tube Q206 is electrically connected to the base of the second switch tube Q206, and the base of the second switch tube Q206 is used to access the pre-charge control signal. Specifically, since the collector of the second switch tube Q206 is electrically connected to the base of the first switch tube Q205, after the base of the second switch tube Q206 receives a signal (such as a BAT-ON signal sent by the chip), the collector and emitter of the second switch tube Q206 are turned on, so that the base of the first switch tube Q205 is connected to the signal and the first switch tube Q205 is turned on. In addition, the second switch tube Q206 can also separate the pre-charge control signal (such as the BAT-ON signal sent by the chip) from the charging voltage VBUS to avoid the phenomenon that the pre-charge control signal is interfered by the charging voltage VBUS.

[0094] It can be understood that the pre-charging switch circuit 60 can also use MOS tubes or IGBT tubes to realize the switching function; or, a third transistor or even a larger number of transistors can be set, the BAT-ON signal emitted by the chip is connected to the base of the third transistor, and the collector of the third transistor is electrically connected to the base of the second switch tube Q206, so that the base of the second switch tube Q206 is controlled by the third transistor.

[0095] In some embodiments of the present application, see Figure 4 , wherein the switch circuit 30 further includes a first PNP transistor Q203; the gates of the first MOS transistor Q201 and the second MOS transistor Q202 are electrically connected to the emitter of the first PNP transistor Q203, the sources of the first MOS transistor Q201 and the second MOS transistor Q202 are electrically connected to the source of the first PNP transistor Q203, and the base of the first PNP transistor Q203 is used to receive the working voltage Vc.

[0096] It should be noted that, when the gates of the first MOS transistor Q201 and the second MOS transistor Q202 and the base of the first PNP transistor are connected to a high-level signal, the first MOS transistor Q201 and the second MOS transistor Q202 are turned on, and the first PNP transistor Q203 is turned off; conversely, when the gates of the first MOS transistor Q201 and the second MOS transistor Q202 and the base of the first PNP transistor are connected to a low-level signal, the first MOS transistor Q201 and the second MOS transistor Q202 are turned off, and the first PNP transistor Q203 is turned on. At the same time, since the closing speed of the first PNP transistor Q203 is greater than the disconnection speeds of the first MOS transistor Q201 and the second MOS transistor Q202, at the closing moment of the first PNP transistor Q203, the first MOS transistor Q201 and the second MOS transistor Q202 are still in the disconnection process. At this time, the negative charges of the substrate metal plates of the first MOS transistor Q201 and the second MOS transistor Q202 can flow to the gate metal plates of the first MOS transistor Q201 and the second MOS transistor Q202 through the first PNP transistor Q203, thereby accelerating the disconnection speed of the first MOS transistor Q201 and the second MOS transistor Q202, and finally achieving the effect of reducing the switching loss of the first MOS transistor Q201 and the second MOS transistor Q202, and preventing the first MOS transistor Q201 and the second MOS transistor Q202 from being damaged.

[0097] It is worth noting that the above contents about the charging control circuit 300 are intended to clearly illustrate the implementation verification process of the present application. Under the guidance of those skilled in the art, equivalent modified designs can also be made. For example, see Figure 4 , a capacitor C228 and a resistor R269 may be connected in parallel between the anode and cathode of the photocoupler U203, and a resistor R208 may be connected in series with the anode of the photocoupler U203 to shape the connected control voltage signal; for another example, a resistor R218, R219, R220 or R221 may be provided as a resistor used for voltage reduction; for another example, Figure 8 As shown, Figure 8 Another circuit diagram of the charging control circuit 300 in the embodiment of the present application is shown. Parallel capacitors EC202 and EC203 may also be provided to filter the signal output by the first secondary winding unit 10 .

[0098] Further, in order to better implement the charging control circuit 300 in the embodiment of the present application, on the basis of the charging control circuit 300, refer to Figure 6 , Figure 6 A flow chart of a charging control method in an embodiment of the present application is shown. The present application also provides a charging control method, which is applied to a processing circuit in a charging control system. The charging control system includes the charging control circuit 300 described in any of the above embodiments. The charging control method includes:

[0099] In step S601, a control parameter of the charging control circuit 300 is detected, where the control parameter includes at least one of the temperature, output voltage, charging time, and output current of the charging control circuit 300;

[0100] In step S602 , when the control parameter meets the preset condition, a control signal is sent to the control circuit 40 in the charging control circuit 300 , so that the charging control circuit 300 supplies power to the external battery module 50 .

[0101] In some embodiments of the present application, the preset condition may be that any one of the temperature, output voltage, charging time, and output current of the charging control circuit 300 satisfies the corresponding (greater than or less than) set value. In some embodiments of the present application, the preset condition may also be that multiple parameters or all parameters of the temperature, output voltage, charging time, and output current of the charging control circuit 300 meet the corresponding set values.

[0102] As an example, when the current temperature of the charging control circuit 300 is detected to be greater than or equal to a preset temperature (e.g., 80°C), it can be determined that the charging control circuit 300 is currently overheated, so a power-off signal can be sent to the control circuit 40 through a processing circuit (e.g., an MCU controller) to disconnect the control circuit 40, thereby disconnecting the control end of the switch circuit 30 from the second secondary winding unit 20, and finally disconnecting the battery module 50 from the second secondary winding unit 10 and stopping charging. Conversely, when the current temperature of the charging control circuit 300 is detected to be less than a preset temperature (e.g., 80°C), a control signal can be sent to the control circuit 40 in the charging control circuit 300 through the processing circuit, and the switch circuit is turned on after receiving the control signal indicating charging, so that the battery module 50 is electrically connected to the second secondary winding unit 10 and the first secondary winding unit and charged.

[0103] As another example, when the output voltage of the charging control circuit 300 is detected to be greater than or equal to a preset voltage (e.g., 200V), it can be determined that the charging control circuit 300 is currently over-voltage, so the MCU controller can send a power-off signal to the control circuit 40 to disconnect the control circuit 40, thereby disconnecting the control end of the switch circuit 30 from the second secondary winding WD2 of the transformer 200, and finally disconnecting the battery module 50 from the first secondary winding WD1 of the transformer 200 and stopping charging. Conversely, when the output voltage of the charging control circuit 300 is detected to be less than a preset voltage (e.g., 200V), a control signal can be sent to the control circuit 40 in the charging control circuit 300 through the processing circuit, and after the switch circuit receives the control signal indicating charging, the switch circuit is turned on, and the battery module 50 is charged normally.

[0104] As another example, when the current charging time of the charging control circuit 300 is detected to be greater than or equal to the preset time (e.g., 10h), it can be determined that the current charging time of the charging control circuit 300 is too long, so the MCU controller can send a power-off signal to the control circuit 40 to disconnect the control circuit 40, thereby disconnecting the control end of the switch circuit 30 from the second secondary winding WD2 of the transformer 200, and finally disconnecting the battery module 50 from the first secondary winding WD1 of the transformer 200 and stopping charging. Conversely, when the current charging time of the charging control circuit 300 is detected to be less than the preset time (e.g., 10h), the processing circuit can send a control signal to the control circuit 40 in the charging control circuit 300, and charge the battery module 50 normally. The preset duration can be the duration set for the parameters fed back by the battery module, and can be the duration manually set by a button or a terminal device; it can be 1h, 1.5h, 5h, 4h, 2h, 6h, 7.5h, 9h, 10h, 12h, etc. This is just an example and there are no excessive restrictions.

[0105] As another example, when the current output current of the charging control circuit 300 is detected to be greater than or equal to the first preset current (e.g., 5A) or less than or equal to the second preset current (2A), it can be determined that the current charging current of the charging control circuit 300 is too large or too small, so the MCU controller can send a power-off signal to the control circuit 40 to disconnect the control circuit 40, thereby disconnecting the control end of the switch circuit 30 from the second secondary winding WD2 of the transformer 200, and finally disconnecting the battery module 50 from the first secondary winding WD1 of the transformer 200 and stopping charging. Conversely, when the current output current of the charging control circuit 300 is detected to be between the first preset current (e.g., 50A) and the second preset current (10A), a control signal can be sent to the control circuit 40 in the charging control circuit 300 through the processing circuit, and the battery module 50 can be charged normally. Both the first preset current and the second preset current can be currents set for the parameters fed back by the battery module, and can be preset currents manually set by a button or a terminal device. For example, the first preset current may be 2A, 5A, 3A, etc., and the second preset current may be 2A, 5A, 3A, etc. 。

[0106] In some embodiments of the present application, see Figure 7 , the charging control method further includes:

[0107] Step S701, detecting a fault signal of the charging control circuit 300, where the fault signal includes at least one of a short circuit signal or a reverse connection signal of the charging control circuit 300;

[0108] Step S701 , when a fault signal is present in the charging control circuit 300 , a power-off signal is sent to the control circuit 40 in the charging control circuit 300 , so that the charging control circuit 300 stops supplying power to the external battery module 50 .

[0109] For example, when a short-circuit signal is detected in the charging control circuit 300, a power-off signal can be sent to the control circuit 40 through the MCU controller, so that the control circuit 40 is disconnected, thereby disconnecting the control end of the switch circuit 30 from the second secondary winding WD2 of the transformer 200, and finally disconnecting the battery module 50 from the first secondary winding WD1 of the transformer 200 and stopping charging. For another example, when a reverse connection signal is detected in the charging control circuit 300, a power-off signal can be sent to the control circuit 40 through the MCU controller, so that the control circuit 40 is disconnected, thereby disconnecting the control end of the switch circuit 30 from the second secondary winding WD2 of the transformer 200, and finally disconnecting the battery module 50 from the first secondary winding WD1 of the transformer 200 and stopping charging.

[0110] It can be understood that the control parameters may also include other characterization information of the charging control circuit 300, such as the ambient humidity and ambient temperature of the charging control circuit 300; or, the fault condition may also include the presence of a short circuit signal in the charging control circuit 300, so as to perform corresponding switch control according to the short circuit phenomenon of the charging control circuit 300.

[0111] Further, in order to better implement the charging control circuit 300 in the embodiment of the present application, on the basis of the charging control circuit 300, the present application also provides a charging control system, the charging control system includes a processing circuit, a PFC circuit electrically connected in sequence, a transformer, and the charging control circuit 300 described in any of the above embodiments, and the charging control system can charge electric vehicles, hybrid vehicles, electric bicycles, electric pedals, electric skateboards and other electric-driven mobile devices. Since the charging control system in the embodiment of the present application is provided with the charging control circuit 300 of the above embodiment, it has all the beneficial effects of the above charging control circuit 300, which will not be repeated here.

[0112] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0113] It should be noted that the electrical connection between two electrical components may be a direct or indirect electrical connection between the two electrical components. For example, the electrical connection between A and B may be a direct connection between A and B, or an indirect electrical connection between A and B through one or more other electrical components.

[0114] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0115] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0116] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0117] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0118] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety, except for application history documents that are inconsistent with or conflicting with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or later attached to this application). It should be noted that if the descriptions, definitions, and / or use of terms in the accompanying materials of this application are inconsistent or conflicting with the content described in this application, the descriptions, definitions, and / or use of terms in this application shall prevail.

[0119] The above is a detailed introduction to a charging control circuit 300, a charging control method and a charging control system provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A charging control circuit, characterized in that: Applied to a charging control system, the charging control system comprises a PFC circuit, a transformer and the charging control circuit electrically connected in sequence, the charging control circuit comprising: a first secondary winding unit, the first secondary winding unit being electrically connected to the first secondary winding of the transformer, and the first secondary winding unit being used to provide charging power to the battery module; a switch circuit, the switch circuit being electrically connected to a main line between an output end of the first secondary winding unit and an output end of the charging control circuit, the switch circuit being used to turn on or off a power supply line from the first secondary winding unit to the battery module; A control circuit, wherein an output end of the control circuit is electrically connected to a control end of the switch circuit, and the control circuit is used to output a control signal to the switch circuit; A second secondary winding unit, the second secondary winding unit is electrically connected to the second secondary winding of the transformer, the output end of the second secondary winding unit is electrically connected to the input end of the control circuit, and the second secondary winding unit is used to provide an operating voltage to the control circuit.

2. The charging control circuit according to claim 1, characterized in that: The switch circuit includes a first MOS tube and a second MOS tube; The first end of the first MOS transistor is electrically connected to the output end of the first secondary winding unit, the second end of the first MOS transistor is electrically connected to the first end of the second MOS transistor, the second end of the second MOS transistor is electrically connected to the output end of the charging control circuit, and the control end of the first MOS transistor and the control end of the second MOS transistor are electrically connected to the output end of the control circuit respectively; The parasitic diode of the first MOS tube is arranged in opposite directions to the parasitic diode of the second MOS tube.

3. The charging control circuit according to claim 1, characterized in that: The control circuit includes a photocoupler; The collector of the photoelectric coupler is electrically connected to the second secondary winding unit, and the emitter of the photoelectric coupler is electrically connected to the control end of the switch circuit; The anode of the photoelectric coupler is used to receive a control voltage signal, and the cathode of the photoelectric coupler is used to be grounded.

4. The charging control circuit according to claim 1, characterized in that: The first secondary winding unit includes a first unidirectional diode, a first resistor and a first capacitor; The first end of the first unidirectional diode is electrically connected to the first end of the first secondary winding of the transformer, the second end of the first unidirectional diode is electrically connected to the first end of the first resistor, and the second end of the first resistor is electrically connected to the input end of the switch circuit; The first end of the first capacitor is electrically connected to the second end of the first resistor, and the second end of the first capacitor is electrically connected to the second end of the first secondary winding of the transformer.

5. The charging control circuit according to claim 1, characterized in that: The first secondary winding unit includes a first unidirectional diode, a first resistor and a first capacitor; A first end of the first unidirectional diode is electrically connected to a first end of a first secondary winding of the transformer, and a second end of the first unidirectional diode is electrically connected to a first end of the first capacitor; The first end of the first resistor is electrically connected to the first end of the first unidirectional diode, and the second end of the first resistor is electrically connected to the second end of the first capacitor.

6. The charging control circuit according to claim 1, characterized in that: The second secondary winding unit includes a second unidirectional diode, a second resistor and a second capacitor; A first end of the second unidirectional diode is electrically connected to a first end of the second secondary winding of the transformer, a second end of the second unidirectional diode is electrically connected to a first end of the second resistor, and a second end of the second resistor is electrically connected to an input end of the control circuit; The first end of the second capacitor is electrically connected to the second end of the second resistor, and the second end of the second capacitor is electrically connected to the second end of the second secondary winding of the transformer.

7. The charging control circuit according to claim 1, characterized in that: The charging control circuit also includes a pre-charging switch circuit; One end of the pre-charging switch circuit is electrically connected to the first secondary winding unit, and the other end is electrically connected to the output end of the charging control circuit, and the pre-charging switch circuit is connected in parallel with the switch circuit; During the operation of the charging control circuit, the switching state of the pre-charging switch circuit and the switching state of the switch circuit are mutually exclusive.

8. The charging control circuit according to claim 7, characterized in that: The pre-charging switch circuit comprises a first switch tube; A first end of the first switch tube is electrically connected to the first secondary winding unit, and a second end of the first switch tube is electrically connected to the battery module.

9. The charging control circuit according to claim 8, characterized in that: The pre-charging switch circuit also includes a second switch tube; The second end of the second switch tube is electrically connected to the control end of the first switch tube, the first end of the second switch tube is electrically connected to the control end of the second switch tube, and the control end of the second switch tube is used to access a pre-charge control signal.

10. A charging control method, characterized in that: A processing circuit applied to a charging control system, the charging control system comprising the charging control circuit according to any one of claims 1 to 9, the charging control method comprising: detecting a control parameter of the charging control circuit, wherein the control parameter comprises at least one of a temperature, an output voltage, a charging time, and an output current of the charging control circuit; When the control parameter meets the preset condition, a control signal is sent to the control circuit in the charging control circuit, so that the charging control circuit supplies power to the external battery module.

11. The charging control method according to claim 10, characterized in that: The charging control method further includes: Detecting a fault signal of the charging control circuit, wherein the fault signal includes at least one of a short circuit signal or a reverse connection signal of the charging control circuit ； When the fault signal is present in the charging control circuit, a power-off signal is sent to a control circuit in the charging control circuit, so that the charging control circuit stops supplying power to the external battery module.

12. A charging control system, characterized in that: The charging control system comprises a processing circuit, a PFC circuit and a transformer electrically connected in sequence, and a charging control circuit as claimed in any one of claims 1 to 9.

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