Charging circuit and mobile power supply

Abstract

The invention discloses a charging circuit and a mobile power supply, and relates to the technical field of charging circuits. The mobile power supply comprises a mains supply access end, a charging pile access end and a battery; the charging circuit comprises a main control circuit; the voltage detection circuit is used for detecting input voltages of the mains supply access end and the charging pile access end and outputting corresponding voltage detection signals; the frequency detection circuit is used for detecting the frequency of the input voltage of the mains supply access end and the charging pile access end and outputting a corresponding frequency detection signal; a switching circuit; a voltage conversion circuit; wherein the main control circuit is used for controlling the switching circuit to connect or disconnect the commercial power access end and the input end of the voltage conversion circuit according to a voltage detection signal, and to disconnect or connect the charging pile access end and the input end of the voltage conversion circuit; the master control circuit is also used for controlling the voltage conversion circuit to work according to the voltage detection signal and the frequency detection signal. The invention aims to improve the compatibility and stability of the mobile power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of charging circuits, and in particular to a charging circuit and a mobile power source. Background Art

[0002] In the prior art, most mobile power supplies are only allowed to be charged with a zigzag AC power socket, but most zigzag AC power socket input wires only allow a maximum current of 10A. This results in a relatively small charging power of the zigzag AC power socket, with a maximum of only 230Vac*10A=2300W. It is understandable that excessive charging power will cause the wire temperature to be too high or even burn out. Therefore, charging with a zigzag AC power socket will result in a small charging current / power, making it take a long time for a large-capacity mobile power supply to be fully charged. Among them, the charging power of an EV charging pile is usually much greater than that of an ordinary zigzag AC power socket. However, existing mobile power supplies cannot safely and stably be compatible with both charging methods of charging with a zigzag AC power socket and charging with an EV charging pile. Summary of the invention

[0003] The main purpose of the present invention is to provide a charging circuit and a mobile power supply, aiming to improve the compatibility and stability of the mobile power supply.

[0004] To achieve the above object, the present invention provides a charging circuit, which is applied to a mobile power supply, wherein the mobile power supply comprises a mains access terminal for accessing the mains, a charging pile access terminal for accessing an AC charging pile, and a battery; the charging circuit comprises:

[0005] Main control circuit;

[0006] A voltage detection circuit, wherein the input end of the voltage detection circuit is electrically connected to the mains access end and the charging pile access end respectively, and the output end of the voltage detection circuit is electrically connected to the main control circuit; the voltage detection circuit is used to detect the input voltage of the mains access end and the charging pile access end, and output a corresponding voltage detection signal;

[0007] A frequency detection circuit, wherein the input end of the frequency detection circuit is electrically connected to the output end of the voltage detection circuit, and the output end of the frequency detection circuit is electrically connected to the main control circuit; the frequency detection circuit is used to detect the frequency of the input voltage of the mains access end and the charging pile access end, and output a corresponding frequency detection signal;

[0008] A switch circuit, wherein a first end of the switch circuit is electrically connected to the mains access end and the charging pile access end respectively, and a controlled end of the switch circuit is electrically connected to the main control circuit;

[0009] a voltage conversion circuit, wherein an input end of the voltage conversion circuit is electrically connected to the second end of the switch circuit, an output end of the voltage conversion circuit is electrically connected to the battery, and a controlled end of the voltage conversion circuit is electrically connected to the main control circuit;

[0010] Among them, the main control circuit is used to control the switch circuit to connect the AC power access terminal and the input terminal of the voltage conversion circuit, and disconnect the charging pile access terminal and the input terminal of the voltage conversion circuit according to the voltage detection signal; or, the main control circuit is used to control the switch circuit to connect the charging pile access terminal and the input terminal of the voltage conversion circuit, and disconnect the AC power input terminal and the input terminal of the voltage conversion circuit according to the voltage detection signal; the main control circuit is also used to control the operation of the voltage conversion circuit according to the voltage detection signal and the frequency detection signal.

[0011] In one embodiment, the voltage detection circuit includes:

[0012] a first voltage detection circuit, wherein an input end of the first voltage detection circuit is electrically connected to the mains access end, and an output end of the first voltage detection circuit is electrically connected to the main control circuit; the first voltage detection circuit is used to detect an input voltage of the mains access end and output a first voltage detection signal;

[0013] a second voltage detection circuit, wherein an input end of the second voltage detection circuit is electrically connected to the charging pile access end, and an output end of the second voltage detection circuit is electrically connected to the main control circuit; the second voltage detection circuit is used to detect the input voltage of the mains access end and output a second voltage detection signal;

[0014] A third voltage detection circuit, wherein the input end of the third voltage detection circuit is electrically connected to the second end of the switch circuit, and the output end of the third voltage detection circuit is electrically connected to the input end of the frequency detection circuit; the third voltage detection circuit is used to detect the input voltage of the mains access end or the charging pile access end, and output a third voltage detection signal.

[0015] In one embodiment, the first voltage detection circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and an operational amplifier;

[0016] Among them, the first end of the first resistor is electrically connected to the first end of the mains access terminal, the second end of the first resistor is electrically connected to the non-inverting input terminal of the operational amplifier and the second end of the third resistor; the first end of the third resistor is electrically connected to the first power supply terminal; the first end of the second resistor is electrically connected to the second end of the mains access terminal, the second end of the second resistor is electrically connected to the inverting input terminal of the operational amplifier and the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the output terminal of the operational amplifier and the first end of the fifth resistor; the second end of the fifth resistor is electrically connected to the second end of the sixth resistor and the main control circuit; the first end of the sixth resistor is electrically connected to the second power supply terminal.

[0017] In one embodiment, the frequency detection circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a comparator;

[0018] Among them, the first end of the seventh resistor is electrically connected to the ground terminal, and the second end of the seventh resistor is electrically connected to the non-phase input terminal of the comparator and the second end of the ninth resistor; the first end of the eighth resistor is electrically connected to the voltage detection circuit, and the second end of the eighth resistor is electrically connected to the inverting input terminal of the comparator; the first end of the ninth resistor is electrically connected to the second power supply terminal; the first end of the tenth resistor is electrically connected to the second power supply terminal, and the second end of the tenth resistor is electrically connected to the output terminal of the comparator and the main control circuit.

[0019] In one embodiment, the switch circuit comprises:

[0020] a first switch circuit, wherein a first end of the first switch circuit is electrically connected to the mains input end, and a controlled end of the first switch circuit is electrically connected to the main control circuit;

[0021] a second switch circuit, wherein a first end of the second switch circuit is electrically connected to an output end of the first switch circuit, a controlled end of the second switch circuit is electrically connected to the main control circuit, and a second end of the second switch circuit is electrically connected to an input end of the voltage conversion circuit;

[0022] a third switch circuit, wherein a first end of the third switch circuit is electrically connected to an input end of the charging pile, a controlled end of the third switch circuit is electrically connected to the main control circuit, and a second end of the third switch circuit is electrically connected to an input end of the voltage conversion circuit;

[0023] Among them, the first switch circuit is used to connect or disconnect the path between the AC power input terminal and the second switch circuit according to the first switch control signal output by the main control circuit; the second switch circuit is used to connect or disconnect the path between the first switch circuit and the voltage conversion circuit according to the second switch control signal output by the main control circuit; the third switch circuit is used to connect or disconnect the path between the charging pile input terminal and the voltage conversion circuit according to the third switch control signal output by the main control circuit.

[0024] In one embodiment, the voltage conversion circuit includes:

[0025] a pre-charge rectifier circuit, wherein the input end of the pre-charge rectifier circuit is electrically connected to the second end of the switch circuit, and the output end of the pre-charge rectifier circuit is electrically connected to the battery; the pre-charge rectifier circuit is used to convert the input first voltage into a second voltage and output it;

[0026] a fourth switch circuit, wherein a first end of the fourth switch circuit is electrically connected to a second end of the switch circuit, a controlled end of the fourth switch circuit is electrically connected to the main control circuit, and a second end of the fourth switch circuit is electrically connected to an input end of the boost rectifier circuit;

[0027] a boost rectifier circuit, wherein an input end of the boost rectifier circuit is electrically connected to the fourth switch circuit, a controlled end of the boost rectifier circuit is electrically connected to the main control circuit, and an output end of the boost rectifier circuit is electrically connected to the battery; the boost rectifier circuit is used to convert an input first voltage into a third voltage and output the third voltage according to a rectification control signal output by the main control circuit;

[0028] The main control circuit is further configured to output a corresponding fourth switch control signal according to the battery voltage detection signal, so as to control the fourth switch circuit to turn on or off the path between the switch circuit and the boost rectifier circuit.

[0029] In one embodiment, the charging circuit further includes:

[0030] A charging confirmation circuit, wherein the input end of the charging confirmation circuit is electrically connected to the input end of the charging pile, and the output end of the charging confirmation circuit is electrically connected to the main control circuit; the charging confirmation circuit is used to output a corresponding connection confirmation signal when the charging pile access end is connected to the charging gun;

[0031] A charging guidance circuit, wherein the input end of the charging guidance circuit is electrically connected to the input end of the charging pile, and the output end of the charging guidance circuit is electrically connected to the main control circuit; the charging guidance circuit is used to guide the working state of the charging pile.

[0032] In one embodiment, the charging confirmation circuit includes an eleventh resistor, a twelfth resistor, and an optical coupler switch;

[0033] Among them, the first end of the optocoupler switch is electrically connected to the third power supply terminal, the second end of the optocoupler switch is electrically connected to the first end of the eleventh resistor, the third end of the optocoupler switch is electrically connected to the second power supply terminal, the fourth end of the optocoupler switch circuit is electrically connected to the first end of the twelfth resistor and the main control circuit; the second end of the eleventh resistor is electrically connected to the charging pile access terminal; the second end of the twelfth resistor is electrically connected to the ground terminal.

[0034] In one embodiment, the charging guidance circuit includes:

[0035] An access detection circuit, wherein the input end of the access detection circuit is electrically connected to the charging pile access end, and the output end of the access detection circuit is electrically connected to the main control circuit; the access detection circuit is used to output an access detection signal when a communication signal is input to the charging access end;

[0036] A first pull-down circuit, wherein a first end of the first pull-down circuit is electrically connected to the charging pile access end, and a second end of the first pull-down circuit is electrically connected to a ground end;

[0037] a second pull-down circuit, wherein a first end of the second pull-down circuit is electrically connected to the charging pile access end, a controlled end of the second pull-down circuit is electrically connected to the main control circuit, and a second end of the first pull-down circuit is electrically connected to a ground end;

[0038] The main control circuit is further used to control the second pull-down circuit to be turned on or off according to the access detection signal output by the access detection circuit.

[0039] The present invention further provides a mobile power supply, comprising a mains access terminal for accessing the mains, a charging pile access terminal for accessing an AC charging pile, a battery, and a charging circuit as described in any one of the above items.

[0040] The technical solution of the present invention detects the voltage of the mains access terminal and / or the charging pile input terminal by using a voltage detection circuit, and outputs a voltage detection signal to the main control circuit, so that the main control circuit confirms whether the mains access terminal and / or the charging pile input terminal are connected to the voltage according to the voltage detection signal, thereby confirming the connection between the mobile power supply and the external power supply. When it is confirmed that there is an input voltage at the mains access terminal and there is no input voltage at the charging pile input terminal, the main control circuit will control the switch circuit to conduct the path between the mains input terminal and the battery; when it is confirmed that there is an input voltage at the charging pile access terminal, the main control circuit will control the switch circuit to conduct the path between the charging pile input terminal and the battery, and disconnect the path between the mains input terminal and the battery. It can be understood that when there is a charging voltage at both the mains access terminal and the charging pile access terminal, the charging pile is preferentially selected for charging. Further, the voltage input at the mains access terminal and the charging pile input terminal is an AC voltage. Therefore, the main control circuit will also confirm the amplitude and frequency of the input voltage through the voltage detection circuit and the frequency detection circuit, and then output the corresponding control signal to the voltage conversion circuit so that the charging voltage of the battery is in a stable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0042] Figure 1 It is a structural schematic diagram of the charging circuit of the present invention;

[0043] Figure 2 FIG. 1 is a schematic diagram of a circuit structure of an embodiment of a charging circuit of the present invention.

[0044] Description of Figure Numbers:

[0045] 10. Main control circuit; 20. Voltage detection circuit; 21. First voltage detection circuit; 22. Second voltage detection circuit; 23. Third voltage detection circuit; 30. Frequency detection circuit; 40. Switch circuit; 41. First switch circuit; 42. Second switch circuit; 43. Third switch circuit; 50. Voltage conversion circuit; 51. Pre-charge rectifier circuit; 52. Fourth switch circuit; 53. Boost rectifier circuit; 60. Charging confirmation circuit; 70. Charging guidance circuit; R1-R23, first resistor-twenty-third resistor; C1, first capacitor; Q1-Q7, first switch tube-seventh switch tube; D1-D5, first diode-fifth diode; L, inductor.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] In the prior art, most mobile power supplies are only allowed to be charged with a zigzag AC power socket, but most zigzag AC power socket input wires only allow a maximum current of 10A. This results in a relatively small charging power of the zigzag AC power socket, with a maximum of only 230Vac*10A=2300W. It is understandable that excessive charging power will cause the wire temperature to be too high or even burn out. Therefore, charging with a zigzag AC power socket will result in a small charging current / power, making it take a long time for a large-capacity mobile power supply to be fully charged. Among them, the charging power of an EV charging pile is usually much greater than that of an ordinary zigzag AC power socket. However, existing mobile power supplies cannot safely and stably be compatible with both charging methods of charging with a zigzag AC power socket and charging with an EV charging pile.

[0051] To solve the above problems, refer to Figure 1 and Figure 2 The present invention provides a charging circuit, which is applied to a mobile power supply, wherein the mobile power supply comprises a mains access terminal for accessing the mains, a charging pile access terminal for accessing an AC charging pile, and a battery; the charging circuit comprises:

[0052] Main control circuit 10;

[0053] A voltage detection circuit 20, wherein the input end of the voltage detection circuit 20 is electrically connected to the main power access end and the charging pile access end respectively, and the output end of the voltage detection circuit 20 is electrically connected to the main control circuit 10; the voltage detection circuit 20 is used to detect the input voltage of the main power access end and the charging pile access end, and output a corresponding voltage detection signal;

[0054] A frequency detection circuit 30, wherein the input end of the frequency detection circuit 30 is electrically connected to the output end of the voltage detection circuit 20, and the output end of the frequency detection circuit 30 is electrically connected to the main control circuit 10; the frequency detection circuit 30 is used to detect the frequency of the input voltage of the mains access end and the charging pile access end, and output a corresponding frequency detection signal;

[0055] A switch circuit 40, wherein a first end of the switch circuit 40 is electrically connected to the mains access end and the charging pile access end respectively, and a controlled end of the switch circuit 40 is electrically connected to the main control circuit 10;

[0056] A voltage conversion circuit 50, wherein an input end of the voltage conversion circuit 50 is electrically connected to the second end of the switch circuit 40, an output end of the voltage conversion circuit 50 is electrically connected to the battery, and a controlled end of the voltage conversion circuit 50 is electrically connected to the main control circuit 10;

[0057] Among them, the main control circuit 10 is used to control the switch circuit 40 to connect the AC power access terminal and the input terminal of the voltage conversion circuit 50, and disconnect the charging pile access terminal and the input terminal of the voltage conversion circuit 50 according to the voltage detection signal; or, the main control circuit 10 is used to control the switch circuit 40 to connect the charging pile access terminal and the input terminal of the voltage conversion circuit 50, and disconnect the AC power input terminal and the input terminal of the voltage conversion circuit 50 according to the voltage detection signal; the main control circuit 10 is also used to control the operation of the voltage conversion circuit 50 according to the voltage detection signal and the frequency detection signal.

[0058] In this embodiment, the main control circuit 10 can be implemented by a main controller, such as SOC (System On Chip), MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), etc. Among them, the main control circuit 10 is connected with the voltage detection circuit 20, the frequency detection circuit 30, the switch circuit 40 and the voltage conversion circuit 50 in the charging circuit, and receives the specific signal output by the corresponding circuit and outputs the corresponding control signal to the corresponding circuit, so that the charging circuit can realize the closed-loop control function.

[0059] In this embodiment, the voltage detection circuit 20 can be implemented by a resistor voltage divider detection circuit, an operational amplifier detection circuit, a Hall detection circuit, etc. Among them, the mobile power supply has a mains access terminal for accessing the mains and a charging pile access terminal for accessing the AC charging pile. The main control circuit 10 needs to use the voltage detection circuit 20 to determine whether there is voltage on the two interfaces to confirm whether the two interfaces are connected to the mains or the charging pile, and then control the switch circuit 40 to turn on or off the corresponding path so that the mains or the charging pile can charge the battery. Therefore, in this embodiment, at least two groups of corresponding voltage detection circuits 20 can be set to detect the mains access terminal and the charging pile access terminal respectively; or a corresponding circuit structure can be set to realize that a group of voltage detection circuits 20 can detect the mains access terminal and the charging pile access terminal at the same time. Optionally, in this embodiment, the voltage detection circuit 20 includes: a first voltage detection circuit 21, the input end of the first voltage detection circuit 21 is electrically connected to the main power access end, and the output end of the first voltage detection circuit 21 is electrically connected to the main control circuit 10; the first voltage detection circuit 21 is used to detect the input voltage of the main power access end and output a first voltage detection signal; a second voltage detection circuit 22, the input end of the second voltage detection circuit 22 is electrically connected to the charging pile access end, and the output end of the second voltage detection circuit 22 is electrically connected to the main control circuit 10; the second voltage detection circuit 22 is used to detect the input voltage of the main power access end and output a second voltage detection signal; a third voltage detection circuit 23, the input end of the third voltage detection circuit 23 is electrically connected to the second end of the switch circuit 40, and the output end of the third voltage detection circuit 23 is electrically connected to the input end of the frequency detection circuit 30; the third voltage detection circuit 23 is used to detect the input voltage of the main power access end or the charging pile access end, and output a third voltage detection signal. It can be understood that the first voltage detection circuit 21 is used to detect the voltage of the mains access terminal; the second voltage detection circuit 22 is used to detect the voltage of the charging pile access terminal; the third voltage detection circuit 23 is set on the charging main circuit, and is used to detect the voltage value on the charging main circuit, so as to assist the detection work of the frequency detection circuit 30. The main control circuit 10 can quickly confirm whether there is voltage at the mains access terminal by receiving the first voltage detection signal output by the first voltage detection circuit 21, thereby confirming whether the mains access terminal is connected, and then controlling the switch circuit 40 to perform the corresponding switch action; by receiving the second voltage detection signal output by the second voltage detection circuit 22, it can quickly confirm whether there is voltage at the mains access terminal, thereby confirming whether the charging pile access terminal is connected, and then controlling the switch circuit 40 to perform the corresponding switch action.

[0060] Optionally, the first voltage detection circuit 21 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and an operational amplifier; wherein the first end of the first resistor R1 is electrically connected to the first end of the mains access terminal, and the second end of the first resistor R1 is electrically connected to the non-inverting input terminal of the operational amplifier and the second end of the third resistor R3; the first end of the third resistor R3 is electrically connected to the first power supply terminal; the first end of the second resistor R2 is electrically connected to the second end of the mains access terminal, and the second end of the second resistor R2 is electrically connected to the inverting input terminal of the operational amplifier and the first end of the fourth resistor R4; the second end of the fourth resistor R4 is electrically connected to the output end of the operational amplifier and the first end of the fifth resistor R5; the second end of the fifth resistor R5 is electrically connected to the second end of the sixth resistor R6 and the main control circuit 10; the first end of the sixth resistor R6 is electrically connected to the second power supply terminal.

[0061] It is understandable that a corresponding auxiliary power supply circuit is also provided in the charging circuit to meet the power supply requirements of some circuits in the charging circuit. In this embodiment, in order to realize the voltage detection of the mains access terminal, the auxiliary power supply circuit is required to input a corresponding power supply voltage to the non-inverting input terminal of the operational amplifier, that is, the first power supply terminal, as a reference voltage, which can be 1.65V. The first voltage detection circuit 21 realizes a voltage drop by passing the voltage input from the mains input terminal through the first resistor R1 and the second resistor R2, and then inputs the non-inverting input terminal and the inverting input terminal of the operational amplifier respectively. The operational amplifier outputs a first voltage detection signal to the main control circuit 10 by combining the reference voltage with the voltage input from the mains input terminal. Among them, the sixth resistor R6 is a pull-up resistor, and the first resistor R1 is a feedback resistor.

[0062] Similarly, the second voltage detection circuit 22 and the third voltage detection circuit 23 may also adopt the same circuit structure, so as to ensure the consistency of the voltage detection signal.

[0063] In this embodiment, the frequency detection circuit 30 can be implemented by a frequency discrimination circuit, a phase-locked loop and other circuits. It can be understood that the main control circuit 10 needs to control the conduction or shutdown of the switch tube in the rectifier circuit through the frequency detection signal output by the frequency detection circuit 30, so as to rectify the input voltage into a corresponding DC voltage to stabilize the charging voltage of the battery. The frequency detection circuit 30 needs to detect the frequency of the AC voltage to be input to the rectifier circuit, and the AC voltage to be input to the rectifier circuit is the input voltage of the mains input terminal and the input voltage of the AC input terminal. Therefore, the frequency detection circuit 30 can be two groups, which are respectively arranged at the mains input terminal and the charging pile input terminal; or, the frequency detection circuit 30 is a group, which is arranged on the main circuit of the charging circuit. Further, when the frequency detection circuit 30 is in two groups, its input end can be electrically connected to the output end of the first voltage detection circuit 21 and the second voltage detection circuit 22 respectively, so as to detect the input voltage frequency and output the corresponding frequency detection signal to the main control circuit 10; when the frequency detection circuit 30 is in one group, its input end can be electrically connected to the second end of the switch circuit 40 respectively, so as to detect the input voltage frequency and output the corresponding frequency detection signal to the main control circuit 10. In the technical solution in which only one frequency detection circuit 30 is used, excessive use of the interface of the main control circuit 10 can be avoided.

[0064] Optionally, the frequency detection circuit 30 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a comparator; wherein the first end of the seventh resistor R7 is electrically connected to the ground end, and the second end of the seventh resistor R7 is electrically connected to the non-inverting input end of the comparator and the second end of the ninth resistor R9; the first end of the eighth resistor R8 is electrically connected to the voltage detection circuit 20, and the second end of the eighth resistor R8 is electrically connected to the inverting input end of the comparator; the first end of the ninth resistor R9 is electrically connected to the second power supply end; the first end of the tenth resistor R10 is electrically connected to the second power supply end, and the second end of the tenth resistor R10 is electrically connected to the output end of the comparator and the main control circuit 10.

[0065] In this embodiment, the third voltage detection circuit 23 is used to obtain the waveform characteristics of the input voltage to ensure that the circuit can accurately reflect the changes in the input voltage. The frequency detection circuit 30 compares the voltage detection signal with a set threshold value by using a comparator. Whenever the input signal exceeds this threshold, the comparator changes its output state and generates a pulse. Among them, the set threshold is the voltage output by the second power supply terminal of the auxiliary power supply circuit, which can be set to 3.3V. The main control circuit 10 can indirectly obtain the frequency information of the input voltage by calculating the number of pulses generated per unit time.

[0066] In this embodiment, the switch circuit 40 can be implemented by at least one switch device, such as a contactor, a circuit breaker, and a relay. Among them, the charging circuit has two sets of power input terminals and the same output circuit. Therefore, the switch circuit 40 can also be implemented by a single-pole double-throw switch. The switch circuit 40 controls the path between the mains access terminal, the charging pile access terminal and the voltage conversion circuit 50 by receiving the corresponding control signal output by the control circuit. It can be understood that the charging efficiency of the charging pile will be greater than that of the mains charging. Therefore, when both the mains access terminal and the charging pile access terminal are connected to the mobile power supply, the main control circuit 10 will preferentially control the switch circuit 40 to conduct the path between the charging pile access terminal and the mains access terminal, thereby realizing rapid charging of the mobile power supply.

[0067] Optionally, the switch circuit 40 includes: a first switch circuit 41, a first end of the first switch circuit 41 is electrically connected to the main power input end, and a controlled end of the first switch circuit 41 is electrically connected to the main control circuit 10; a second switch circuit 42, a first end of the second switch circuit 42 is electrically connected to the output end of the first switch circuit 41, a controlled end of the second switch circuit 42 is electrically connected to the main control circuit 10, and a second end of the second switch circuit 42 is electrically connected to the input end of the voltage conversion circuit 50; a third switch circuit 43, a first end of the third switch circuit 43 is electrically connected to the charging pile input end, and a controlled end of the third switch circuit 43 is electrically connected to the main control circuit 10. The first switch circuit 41 is used to connect or disconnect the path between the AC power input terminal and the second switch circuit 42 according to the first switch control signal output by the main control circuit 10; the second switch circuit 42 is used to connect or disconnect the path between the first switch circuit 41 and the voltage conversion circuit 50 according to the second switch control signal output by the main control circuit 10; the third switch circuit 43 is used to connect or disconnect the path between the charging pile input terminal and the voltage conversion circuit 50 according to the third switch control signal output by the main control circuit 10.

[0068] In this embodiment, the first switch circuit 41 and the second switch circuit 42 are used to turn on or off the path between the mains input terminal and the voltage conversion circuit 50; the third switch circuit 43 is used to turn on or off the path between the charging pile access terminal and the voltage conversion circuit 50. Among them, the mains accessed by the mains access terminal will be completely controlled by the first switch circuit 41 and the second switch circuit 42, while the AC power accessed by the charging pile access terminal is jointly controlled by the charging pile itself and the third switch circuit 43. In the case of using a single relay switch, the path between the mains input terminal and the voltage conversion circuit 50 may have the problem of relay single-point failure adhesion, which may cause the charging control between the mains access terminal and the battery to be unable to be stably controlled. Therefore, in the technical solution of the present application, the first switch circuit 41 and the second switch circuit 42 are used to jointly realize the conduction or disconnection of the path between the mains access terminal and the voltage conversion circuit 50, thereby avoiding the problem that the charging control between the mains access terminal and the battery cannot be stably controlled due to the single-point failure adhesion of the relay. Furthermore, when the first switch circuit 41 and the second switch circuit 42 are in the on state, the third switch circuit will be in the off state; when the third switch circuit 43 is in the on state, the first switch circuit 41 and the second switch circuit 42 are in the off state.

[0069] In this embodiment, the voltage conversion circuit 50 can be implemented by a rectifier circuit, a boost circuit, etc. Among them, the rectifier circuit can be implemented by half-wave rectification, full-wave rectification circuit, controlled rectifier circuit, etc.; the boost circuit can be implemented by Boost conversion, coupled inductor L boost circuit, etc. It can be understood that the voltage input from the mains access terminal and the charging pile access terminal is AC, and the charging voltage required by the battery is DC voltage. Therefore, the charging circuit needs to be set up with a corresponding rectifier circuit to convert the input AC into DC, and then charge the battery.

[0070] Optionally, the voltage conversion circuit 50 includes:

[0071] A pre-charge rectifier circuit 51, wherein the input end of the pre-charge rectifier circuit 51 is electrically connected to the second end of the switch circuit 40, and the output end of the pre-charge rectifier circuit 51 is electrically connected to the battery; the pre-charge rectifier circuit 51 is used to convert the input first voltage into a second voltage and output it;

[0072] a fourth switch circuit 52, wherein a first end of the fourth switch circuit 52 is electrically connected to a second end of the switch circuit 40, a controlled end of the fourth switch circuit 52 is electrically connected to the main control circuit 10, and a second end of the fourth switch circuit 52 is electrically connected to an input end of the boost rectifier circuit 53;

[0073] a boost rectifier circuit 53, wherein an input end of the boost rectifier circuit 53 is electrically connected to the fourth switch circuit 52, a controlled end of the boost rectifier circuit 53 is electrically connected to the main control circuit 10, and an output end of the boost rectifier circuit 53 is electrically connected to the battery; the boost rectifier circuit 53 is used to convert the input first voltage into a third voltage and output it according to the rectification control signal output by the main control circuit 10;

[0074] The main control circuit 10 is further configured to output a corresponding fourth switch control signal according to the battery voltage detection signal, so as to control the fourth switch circuit 52 to turn on or off the path between the switch circuit 40 and the boost rectifier circuit 53 .

[0075] Further, the pre-charge rectifier circuit 51 includes a thirteenth resistor R13, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the boost rectifier circuit 53 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a first capacitor C1, and a first inductor L;

[0076] Among them, the first end of the thirteenth resistor R13 is electrically connected to the second end of the switch circuit 40 and the first end of the fourth switch circuit 52, and the second end of the thirteenth resistor R13 is electrically connected to the anode of the fourth diode D4 and the cathode of the third diode D3; the cathode of the fourth diode D4 is electrically connected to the cathode of the first diode D1 and the positive electrode of the battery; the anode of the first diode D1 is electrically connected to the cathode of the second diode D2, and the anode of the fourth diode D4 is electrically connected to the second end of the switch circuit 40, the first end of the fourth switch circuit 52, and the anode of the third diode D3; the first The first end of the capacitor C1 is electrically connected to the first end of the first inductor L and the second end of the fourth switch circuit 52; the second end of the first capacitor C1 is electrically connected to the second end of the fourth switch circuit 52, the second end of the third switch tube Q3, and the first end of the fourth switch tube Q4; the second end of the first inductor L is electrically connected to the second end of the first switch tube Q1 and the first end of the second switch tube Q2; the first end of the first switch tube Q1 is electrically connected to the first end of the third switch tube Q3 and the positive electrode of the battery; the second end of the second switch tube Q2 is electrically connected to the second end of the fourth switch tube Q4 and the negative electrode of the battery.

[0077] In this embodiment, a corresponding battery voltage detection circuit 20 is provided in the charging circuit to detect the current voltage of the battery. The pre-charge rectifier circuit 51 realizes the pre-charging of the battery by using the eleventh resistor R11 as a soft-start resistor and a rectifier bridge circuit. It is understandable that for batteries that have not been used for a long time or batteries in a deep discharge state, direct high-current charging may cause damage to the internal structure of the battery. Pre-charging can gently activate the chemical substances in the battery to avoid local overheating or other irreversible damage caused by sudden high-current shocks. In addition, when the battery in the mobile power supply is a lithium-ion battery, if it is quickly charged from an extremely low voltage, it may cause an internal short circuit or generate too much heat, which may lead to thermal runaway, and then cause a dangerous situation of fire or explosion. Therefore, in this embodiment, the battery is pre-charged by using the pre-charge rectifier circuit 51 to ensure the service life of the battery and improve the safety of the mobile power supply charging process. Further, in order to ensure the charging efficiency of the battery in the mobile power supply. In this embodiment, the battery voltage is detected by the battery voltage detection circuit 20 to determine whether the battery can end the pre-charging stage at this time. When the battery voltage reaches a preset value, the main control circuit 10 controls the fourth switch circuit 52 to conduct the path between the second end of the switch circuit 40 and the boost rectifier circuit 53. At this time, the AC voltage input from the mains input terminal or the charging pile input terminal will no longer pass through the pre-charge rectifier circuit 51, but will be boosted and rectified by the boost rectifier circuit 53 to improve the charging efficiency of the battery.

[0078] By using the voltage detection circuit 20 to detect the voltage of the mains access terminal and / or the charging pile input terminal, and outputting the voltage detection signal to the main control circuit 10, the main control circuit 10 can confirm whether the mains access terminal and / or the charging pile input terminal are connected to the voltage according to the voltage detection signal, thereby confirming the connection between the mobile power supply and the external power supply. When it is confirmed that there is an input voltage at the mains access terminal and there is no input voltage at the charging pile input terminal, the main control circuit 10 will control the switch circuit 40 to conduct the path between the mains input terminal and the battery; when it is confirmed that there is an input voltage at the charging pile access terminal, the main control circuit 10 will control the switch circuit 40 to conduct the path between the charging pile input terminal and the battery, and disconnect the path between the mains input terminal and the battery. It can be understood that when there is a charging voltage at both the mains access terminal and the charging pile access terminal, the charging pile is preferentially selected for charging. Further, the voltage input at the mains access terminal and the charging pile input terminal is an AC voltage. Therefore, the main control circuit 10 will also confirm the amplitude and frequency of the input voltage through the voltage detection circuit 20 and the frequency detection circuit 30, and then output a corresponding control signal to the voltage conversion circuit 50 to keep the charging voltage of the battery in a stable state.

[0079] refer to Figure 1 and Figure 2In one embodiment of the present invention, the charging circuit further includes:

[0080] A charging confirmation circuit 60, wherein the input end of the charging confirmation circuit 60 is electrically connected to the input end of the charging pile, and the output end of the charging confirmation circuit 60 is electrically connected to the main control circuit 10; the charging confirmation circuit 60 is used to output a corresponding connection confirmation signal when the charging pile access end is connected to the charging gun;

[0081] A charging guidance circuit, wherein the input end of the charging guidance circuit is electrically connected to the input end of the charging pile, and the output end of the charging guidance circuit is electrically connected to the main control circuit 10; the charging guidance circuit is used to guide the working state of the charging pile.

[0082] In this embodiment, the charging confirmation circuit 60 can be implemented by a switch trigger circuit, etc. It should be understood that when the input end of the charging pile is connected to the charging gun of the charging pile, the charging pile and the mobile power supply will confirm the charging access through the CC pin in the charging gun and the charging pile access end. Optionally, the charging confirmation circuit 60 includes an eleventh resistor R11, a twelfth resistor R12, and an optocoupler switch; wherein the first end of the optocoupler switch is electrically connected to the third power supply end, the second end of the optocoupler switch is electrically connected to the first end of the eleventh resistor R11, the third end of the optocoupler switch is electrically connected to the second power supply end, and the fourth end of the optocoupler switch circuit 40 is electrically connected to the first end of the twelfth resistor R12 and the main control circuit 10; the second end of the eleventh resistor R11 is electrically connected to the charging pile access end; the second end of the twelfth resistor R12 is electrically connected to the ground end. Wherein, the third power supply end is a power output end of the auxiliary power supply circuit, which outputs a 5V voltage after electrical isolation, i.e., 5V_ISO. When the charging gun of the charging pile is connected to the charging pile access end, the first end and the second end of the optocoupler switch are turned on, and the light-emitting diode therein will output a light signal. At this time, the third end and the fourth end of the optocoupler switch are turned on. The corresponding port connected to the main control circuit 10 and the charging confirmation circuit 60 will receive a high-level signal, thereby confirming that the charging pile access end is accurately connected to the charging gun.

[0083] In this embodiment, the charging guidance circuit can be implemented by using a corresponding resistance circuit and a switch circuit 40. The charging circuit confirms the maximum current that the charging pile can output through the charging guidance circuit 70, and feeds back the corresponding signal, so that the charging pile confirms the current state of the mobile power supply, and then confirms whether to output voltage. Optionally, the charging guidance circuit 70 includes: an access detection circuit, the input end of the access detection circuit is electrically connected to the charging pile access end, and the output end of the access detection circuit is electrically connected to the main control circuit 10; the access detection circuit is used to output an access detection signal when a communication signal is input to the charging access end; a first pull-down circuit, the first end of the first pull-down circuit is electrically connected to the charging pile access end, and the second end of the first pull-down circuit is electrically connected to the ground end; a second pull-down circuit, the first end of the second pull-down circuit is electrically connected to the charging pile access end, the controlled end of the second pull-down circuit is electrically connected to the main control circuit 10, and the second end of the first pull-down circuit is electrically connected to the ground end; wherein the main control circuit 10 is also used to control the second pull-down circuit to be turned on or off according to the access detection signal output by the access detection circuit.

[0084] Optionally, the access detection circuit includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fifth diode D5, a fifth switch tube Q5, and a first optical coupler switch;

[0085] Among them, the anode of the fifth diode D5 is electrically connected to the charging pile access end, and the cathode of the fifth diode D5 is electrically connected to the first end of the fourteenth resistor R14; the second end of the fourteenth resistor R14 is electrically connected to the controlled end of the fifth switch tube Q5; the first end of the fifth switch tube Q5 is electrically connected to the second end of the fifteenth resistor R15, and the second end of the fifth open-hang tube is electrically connected to the ground end; the first end of the fifteenth resistor R15 is electrically connected to the second end of the first optocoupler switch; the first end of the first optocoupler switch is electrically connected to the third power supply end, the third end of the first optocoupler switch is electrically connected to the second power supply end, and the fourth end of the first optocoupler switch is electrically connected to the main control circuit 10 and the first end of the sixteenth resistor R16; the second end of the sixteenth resistor R16 is electrically connected to the ground end.

[0086] Optionally, the first pull-down circuit includes a seventeenth resistor R17; wherein a first end of the seventeenth resistor R17 is electrically connected to the cathode of the fifth diode D5, and a second end of the seventeenth resistor R17 is electrically connected to the ground.

[0087] Optionally, the second pull-down circuit includes an eighteenth resistor R18, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a second optical coupler switch, a sixth switch tube Q6, and a seventh switch tube Q7; wherein the first end of the eighteenth resistor R18 is electrically connected to the cathode of the fifth diode D5, and the second end of the eighteenth resistor R18 is electrically connected to the first end of the sixth switch tube Q6; the second end of the sixth switch tube Q6 is electrically connected to the seventeenth resistor R17 and the ground end, and the controlled end of the sixth switch tube Q6 is electrically connected to the second end of the nineteenth resistor R19; the first end of the nineteenth resistor R19 is electrically connected to the first end of the twentieth resistor R20 and the fourth end of the second optical coupler switch; The second end of the 20th resistor R20 is electrically connected to the ground end; the third end of the second optical coupler switch is electrically connected to the second power supply end, the first end of the second optical coupler switch is electrically connected to the third power supply end, and the second end of the second optical coupler switch is electrically connected to the first end of the 21st resistor R21; the second end of the 21st resistor R21 is electrically connected to the first end of the seventh switch tube Q7; the second end of the seventh switch tube Q7 is electrically connected to the second end of the 22nd resistor R22 and the ground end, and the controlled end of the seventh switch tube Q7 is electrically connected to the first end of the 22nd resistor R22 and the second end of the 23rd resistor R23; the first end of the 23rd resistor R23 is electrically connected to the main control circuit 10.

[0088] In this embodiment, when the charging gun of the charging pile is electrically connected to the charging pile access end of the mobile power supply, the charging pile will input a 12V voltage to the charging guidance circuit 70 through the charging gun. Among them, the 12V voltage will act on the controlled end of the fifth switch tube Q5, thereby controlling the fifth switch tube Q5 to be turned on. At this time, the diode in the first optocoupler switch is turned on, so that the port connected to the main control circuit 10 is pulled down. The main control circuit 10 obtains the high-level signal to confirm that the charging gun of the charging pile and the charging pile access end of the mobile power supply are in a connection relationship. Further, the charging pile will input a 12V voltage to the charging guidance circuit 70 through the charging gun, and under the first pull-down circuit in the charging guidance circuit 70, the 12V voltage will be pulled down to 9V. At this time, the charging pile will confirm the voltage change through the corresponding voltage detection circuit 20, and then output a PWM signal with an amplitude of 12V to the charging guidance circuit 70. It can be seen from the above content that the charging gun of the charging pile is in a connection relationship with the charging pile access end of the mobile power supply, and the access detection circuit will output a high-level signal to the main control circuit 10. The main control circuit 10 will control the seventh switch tube Q7 to turn on according to the high-level signal, so that the second optocoupler switch controls the sixth switch tube Q6 to turn on, so that the eighteenth resistor R18 is turned on and grounded, thereby further pulling down the 12 voltage to 6V. At this time, the charging pile will confirm the voltage change through the corresponding voltage detection circuit 20, thereby confirming that the mobile power supply has completed the preparation for receiving charging, and then control the internal switch circuit 40 to output the corresponding AC voltage to the charging pile access end. It can be understood that when the charging pile outputs a PWM signal with an amplitude of 12V, the voltage amplitude detected by it is not 6V, then it is considered that there is a fault in the circuit, and then the internal switch circuit 40 is controlled to disconnect the output of the corresponding AC voltage to the charging pile access end to achieve charging protection.

[0089] The present invention also proposes a mobile power supply, which includes a mains access terminal for accessing the mains, a charging pile access terminal for accessing the AC charging pile, a battery, and a charging circuit as described in any one of the above. It is worth noting that since the battery control board of the present invention is based on the above-mentioned battery management circuit, the embodiments of the battery control board of the present invention include all technical solutions of all embodiments of the above-mentioned battery management circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0090] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A charging circuit, applied to a mobile power source, characterized in that: The mobile power supply comprises a mains access terminal for accessing the mains, a charging pile access terminal for accessing the AC charging pile, and a battery; The charging circuit comprises: Main control circuit; A voltage detection circuit, wherein the input end of the voltage detection circuit is electrically connected to the mains access end and the charging pile access end respectively, and the output end of the voltage detection circuit is electrically connected to the main control circuit; the voltage detection circuit is used to detect the input voltage of the mains access end and the charging pile access end, and output a corresponding voltage detection signal; A frequency detection circuit, wherein the input end of the frequency detection circuit is electrically connected to the output end of the voltage detection circuit, and the output end of the frequency detection circuit is electrically connected to the main control circuit; the frequency detection circuit is used to detect the frequency of the input voltage of the mains access end and the charging pile access end, and output a corresponding frequency detection signal; A switch circuit, wherein a first end of the switch circuit is electrically connected to the mains access end and the charging pile access end respectively, and a controlled end of the switch circuit is electrically connected to the main control circuit; a voltage conversion circuit, wherein an input end of the voltage conversion circuit is electrically connected to the second end of the switch circuit, an output end of the voltage conversion circuit is electrically connected to the battery, and a controlled end of the voltage conversion circuit is electrically connected to the main control circuit; Among them, the main control circuit is used to control the switch circuit to connect the AC power access terminal and the input terminal of the voltage conversion circuit, and disconnect the charging pile access terminal and the input terminal of the voltage conversion circuit according to the voltage detection signal; or, the main control circuit is used to control the switch circuit to connect the charging pile access terminal and the input terminal of the voltage conversion circuit, and disconnect the AC power input terminal and the input terminal of the voltage conversion circuit according to the voltage detection signal; the main control circuit is also used to control the operation of the voltage conversion circuit according to the voltage detection signal and the frequency detection signal.

2. The charging circuit according to claim 1, characterized in that: The voltage detection circuit comprises: a first voltage detection circuit, wherein an input end of the first voltage detection circuit is electrically connected to the mains access end, and an output end of the first voltage detection circuit is electrically connected to the main control circuit; the first voltage detection circuit is used to detect an input voltage of the mains access end and output a first voltage detection signal; a second voltage detection circuit, wherein an input end of the second voltage detection circuit is electrically connected to the charging pile access end, and an output end of the second voltage detection circuit is electrically connected to the main control circuit; the second voltage detection circuit is used to detect the input voltage of the mains access end and output a second voltage detection signal; A third voltage detection circuit, wherein the input end of the third voltage detection circuit is electrically connected to the second end of the switch circuit, and the output end of the third voltage detection circuit is electrically connected to the input end of the frequency detection circuit; the third voltage detection circuit is used to detect the input voltage of the mains access end or the charging pile access end, and output a third voltage detection signal.

3. The charging circuit according to claim 2, characterized in that: The first voltage detection circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and an operational amplifier; Among them, the first end of the first resistor is electrically connected to the first end of the mains access terminal, the second end of the first resistor is electrically connected to the non-inverting input terminal of the operational amplifier and the second end of the third resistor; the first end of the third resistor is electrically connected to the first power supply terminal; the first end of the second resistor is electrically connected to the second end of the mains access terminal, the second end of the second resistor is electrically connected to the inverting input terminal of the operational amplifier and the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the output terminal of the operational amplifier and the first end of the fifth resistor; the second end of the fifth resistor is electrically connected to the second end of the sixth resistor and the main control circuit; the first end of the sixth resistor is electrically connected to the second power supply terminal.

4. The charging circuit according to claim 1, characterized in that: The frequency detection circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a comparator; Among them, the first end of the seventh resistor is electrically connected to the ground terminal, and the second end of the seventh resistor is electrically connected to the non-phase input terminal of the comparator and the second end of the ninth resistor; the first end of the eighth resistor is electrically connected to the voltage detection circuit, and the second end of the eighth resistor is electrically connected to the inverting input terminal of the comparator; the first end of the ninth resistor is electrically connected to the second power supply terminal; the first end of the tenth resistor is electrically connected to the second power supply terminal, and the second end of the tenth resistor is electrically connected to the output terminal of the comparator and the main control circuit.

5. The charging circuit according to claim 1, characterized in that: The switch circuit comprises: a first switch circuit, wherein a first end of the first switch circuit is electrically connected to the mains input end, and a controlled end of the first switch circuit is electrically connected to the main control circuit; a second switch circuit, wherein a first end of the second switch circuit is electrically connected to an output end of the first switch circuit, a controlled end of the second switch circuit is electrically connected to the main control circuit, and a second end of the second switch circuit is electrically connected to an input end of the voltage conversion circuit; a third switch circuit, wherein a first end of the third switch circuit is electrically connected to an input end of the charging pile, a controlled end of the third switch circuit is electrically connected to the main control circuit, and a second end of the third switch circuit is electrically connected to an input end of the voltage conversion circuit; Among them, the first switch circuit is used to connect or disconnect the path between the AC power input terminal and the second switch circuit according to the first switch control signal output by the main control circuit; the second switch circuit is used to connect or disconnect the path between the first switch circuit and the voltage conversion circuit according to the second switch control signal output by the main control circuit; the third switch circuit is used to connect or disconnect the path between the charging pile input terminal and the voltage conversion circuit according to the third switch control signal output by the main control circuit.

6. The charging circuit according to claim 1, characterized in that: The voltage conversion circuit comprises: a pre-charge rectifier circuit, wherein the input end of the pre-charge rectifier circuit is electrically connected to the second end of the switch circuit, and the output end of the pre-charge rectifier circuit is electrically connected to the battery; the pre-charge rectifier circuit is used to convert the input first voltage into a second voltage and output it; a fourth switch circuit, wherein a first end of the fourth switch circuit is electrically connected to a second end of the switch circuit, a controlled end of the fourth switch circuit is electrically connected to the main control circuit, and a second end of the fourth switch circuit is electrically connected to an input end of the boost rectifier circuit; a boost rectifier circuit, wherein an input end of the boost rectifier circuit is electrically connected to the fourth switch circuit, a controlled end of the boost rectifier circuit is electrically connected to the main control circuit, and an output end of the boost rectifier circuit is electrically connected to the battery; the boost rectifier circuit is used to convert an input first voltage into a third voltage and output the third voltage according to a rectification control signal output by the main control circuit; The main control circuit is further configured to output a corresponding fourth switch control signal according to the battery voltage detection signal, so as to control the fourth switch circuit to turn on or off the path between the switch circuit and the boost rectifier circuit.

7. The charging circuit according to claim 1, characterized in that: The charging circuit further comprises: A charging confirmation circuit, wherein the input end of the charging confirmation circuit is electrically connected to the input end of the charging pile, and the output end of the charging confirmation circuit is electrically connected to the main control circuit; the charging confirmation circuit is used to output a corresponding connection confirmation signal when the charging pile access end is connected to the charging gun; A charging guidance circuit, wherein the input end of the charging guidance circuit is electrically connected to the input end of the charging pile, and the output end of the charging guidance circuit is electrically connected to the main control circuit; the charging guidance circuit is used to guide the working state of the charging pile.

8. The charging circuit according to claim 7, characterized in that: The charging confirmation circuit includes an eleventh resistor, a twelfth resistor, and an optical coupler switch; Among them, the first end of the optocoupler switch is electrically connected to the third power supply terminal, the second end of the optocoupler switch is electrically connected to the first end of the eleventh resistor, the third end of the optocoupler switch is electrically connected to the second power supply terminal, the fourth end of the optocoupler switch circuit is electrically connected to the first end of the twelfth resistor and the main control circuit; the second end of the eleventh resistor is electrically connected to the charging pile access terminal; the second end of the twelfth resistor is electrically connected to the ground terminal.

9. The charging circuit according to claim 7, characterized in that: The charging guidance circuit comprises: An access detection circuit, wherein the input end of the access detection circuit is electrically connected to the charging pile access end, and the output end of the access detection circuit is electrically connected to the main control circuit; the access detection circuit is used to output an access detection signal when a communication signal is input to the charging access end; A first pull-down circuit, wherein a first end of the first pull-down circuit is electrically connected to the charging pile access end, and a second end of the first pull-down circuit is electrically connected to a ground end; a second pull-down circuit, wherein a first end of the second pull-down circuit is electrically connected to the charging pile access end, a controlled end of the second pull-down circuit is electrically connected to the main control circuit, and a second end of the first pull-down circuit is electrically connected to a ground end; The main control circuit is further used to control the second pull-down circuit to be turned on or off according to the access detection signal output by the access detection circuit.

10. A mobile power source, characterized in that: The mobile power supply comprises a mains access terminal for accessing the mains, a charging pile access terminal for accessing an AC charging pile, a battery and a charging circuit as claimed in any one of claims 1 to 9.

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