Safe charger

Abstract

The utility model provides a safe charger, and belongs to the technical field of chargers. The glue supply transmission device comprises a contactor module, a transformer, a rectifying circuit, a battery, a controller, a voltage acquisition module and a switch module. When the controller is powered on, the switch module is controlled to be closed, the first loop is powered on, the coil of the contactor module corresponding to the switch module is powered on, the wiring contact corresponding to the coil of the contactor module is conducted, and the rectifying circuit rectifies alternating current output by the output end of the transformer into direct current for charging the battery. The voltage acquisition module acquires real-time voltage at two ends of the battery, the controller controls the switch module to be disconnected when the real-time voltage is larger than first preset voltage, the first loop is disconnected, the coil of the contactor module corresponding to the switch module is powered off, the wiring contact corresponding to the coil of the contactor module is disconnected, and the battery stops charging. Thermal runaway of the battery is avoided, and the battery is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of chargers, and particularly relates to a safe charger. Background Art

[0002] Overcharging and over-discharging of the battery seriously endanger the health of the battery. During the charging process of the battery, excessive voltage, current, and temperature may all lead to battery thermal runaway, and battery thermal runaway is the main cause of accidents. Content of the Utility Model

[0003] The purpose of the utility model is to provide a safe charger in view of the deficiencies of the above-mentioned prior art.

[0004] The utility model provides a safe charger, which includes a contactor module, a transformer, a rectification circuit, a battery, a controller, a voltage acquisition module, and a switch module. One end of the wiring contact of the contactor module is electrically connected to the mains power supply device, and the other end is electrically connected to the input end of the transformer. The wiring contact of the contactor module is used to conduct when the coil of the corresponding contactor module is energized; one end of the rectification circuit is electrically connected to the output end of the transformer, and the other end is electrically connected to the battery, and is used to rectify the alternating current transmitted by the transformer into direct current for charging the battery; the coil of the contactor module, the switch module, the control circuit part of the controller, and the mains power supply device are connected in series to form a first loop; the battery is electrically connected to the power supply part of the controller to supply power to the controller. When the controller is energized, it controls the switch module to close, so that the coil of the contactor module corresponding to the switch module is energized; the voltage acquisition module is used to acquire the real-time voltage across the battery, and the controller is used to control the switch module to disconnect when the real-time voltage is greater than a first preset voltage, so that the coil of the contactor module corresponding to the switch module is de-energized.

[0005] Further, the transformer is a leakage magnetic transformer.

[0006] Further, it further includes a reactive power compensation circuit with its input end and output end respectively connected to the output end of the transformer and the rectification circuit. The reactive power compensation circuit is used to compensate the reactive power of the transformer for transmitting alternating current to the rectification circuit.

[0007] Further, it further includes a sampling resistor connected in series with the battery and a current acquisition module for acquiring the real-time current of the sampling resistor. The controller is used to control the switch module to disconnect when the real-time current is greater than a first preset current, so that the coil of the contactor module corresponding to the switch module is de-energized.

[0008] Further, it further includes a fuse protection module for protecting the controller. The coil of the contactor module, the switch module, the control circuit part of the controller, the mains power supply device, and the fuse protection module are connected in series to form a first loop.

[0009] Further, the contactor module includes a plurality of contactors, and the switch module includes a main control switch and a plurality of conducting switches; the wiring contacts of the plurality of contactors are connected to different windings on the transformer, so that the transformer outputs voltages of different levels; the plurality of conducting switches are respectively connected in series with the coils of the plurality of contactors to form a plurality of first conducting circuits, and the plurality of first conducting circuits are connected in parallel to form a second conducting circuit; the second conducting circuit, the main control switch, the control circuit part of the controller, the fuse protection module, and the mains power supply device are connected in series to form a first loop; the plurality of conducting switches are arranged corresponding to the coils of the plurality of contactors, the plurality of conducting switches are interlocked, and the wiring contacts of the plurality of contactors are interlocked; when the controller is powered on, it controls one of the conducting switches to close, and the coil of the contactor corresponding to the conducting switch conducts when the main control switch and the fuse protection module are both closed.

[0010] Further, a stop button is further included, and the controller is used to control the main control switch to disconnect when the stop button is activated.

[0011] Further, a first temperature acquisition module for acquiring the first real-time temperature of the battery is further included, and the controller is used to control the switch module to disconnect when the first real-time temperature is greater than the first preset temperature, so that the coil of the contactor module corresponding to the switch module is powered off.

[0012] Further, a varistor is further included, which is connected in parallel with the output end of the rectifier circuit to prevent the output voltage of the rectifier circuit from fluctuating.

[0013] Further, a second temperature acquisition module for acquiring the second real-time temperature of the transformer is further included, and the controller is used to control the switch module to disconnect when the second real-time temperature is greater than the second preset temperature, so that the coil of the contactor module corresponding to the switch module is powered off.

[0014] The safety charger of the present utility model has the following beneficial effects:

[0015] The battery supplies power to the controller. When the controller is powered on, it controls the switch module to close, then the first loop is powered on, the coil of the contactor module corresponding to the switch module is powered on, then the wiring contact corresponding to the coil of the contactor module conducts, then the mains power supply device supplies power to the input end of the transformer, the rectifier circuit rectifies the alternating current output by the output end of the transformer into direct current for charging the battery, the voltage acquisition module acquires the real-time voltage across the battery, and when the real-time voltage is greater than the first preset voltage, the controller controls the switch module to disconnect, then the first loop is disconnected, then the coil of the contactor module corresponding to the switch module is powered off, then the wiring contact corresponding to the coil of the contactor module is disconnected, then the mains power supply device stops supplying power to the transformer, then the battery stops charging, avoiding thermal runaway of the battery, protecting the battery, and improving the safety of the charger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings incorporated herein and constituting a part of this specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model. In these drawings, like reference numerals are used to represent like elements. The drawings in the following description are some embodiments of the present utility model, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram in a safety charger according to an embodiment of the present utility model;

[0018] Figure 2 It is a partial schematic diagram in a safety charger according to an embodiment of the present utility model.

[0019] In the figure: 1 - Contactor, 2 - Transformer, 3 - Reactive power compensation circuit, 4 - Rectification circuit, 5 - Battery, 6 - Controller, 71 - Main control switch, 72 - Conducting switch, 81 - Fuse protection module, 82 - Stop button, 91 - Voltage acquisition module, 92 - Sampling resistor, 93 - Current acquisition module, 94 - Varistor, 95 - Main control panel power supply module, 96 - Mains power supply device, 97 - First temperature acquisition module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily.

[0021] Please refer to Figures 1 to 2. A safety charger according to an embodiment of the present utility model includes a contactor module, a transformer 2, a rectifier circuit 4, a battery 5, a controller 6, a voltage acquisition module 91, and a switch module. One end of the connection contact of the contactor module is electrically connected to the mains power supply device 96, and the other end is electrically connected to the input end of the transformer 2. The connection contact of the contactor module is used to conduct when the coil of the corresponding contactor module is energized; one end of the rectifier circuit 4 is electrically connected to the output end of the transformer 2, and the other end is electrically connected to the battery 5, and is used to rectify the alternating current transmitted by the transformer 2 into direct current for charging the battery 5; the coil of the contactor module, the switch module, the control circuit part of the controller 6, and the mains power supply device 96 are connected in series to form a first loop; the battery 5 is electrically connected to the power supply part of the controller 6 and is used to supply power to the controller 6. When the controller 6 is energized, it controls the switch module to close, so that the coil of the contactor module corresponding to the switch module is energized; the voltage acquisition module 91 is used to acquire the real-time voltage across the battery 5, and the controller 6 is used to control the switch module to open when the real-time voltage is greater than the first preset voltage, so that the coil of the contactor module corresponding to the switch module is de-energized.

[0022] Here, the battery 5 is a rechargeable battery 5. The two ends of the connection contact of the contactor module are respectively connected to the mains power supply device 96 and the input end of the transformer 2. One end of the rectifier circuit 4 is connected to the output end of the transformer 2, and the other end is connected to the battery 5. When the coil of the contactor module is de-energized, the connection contact of the corresponding contactor module is disconnected, and when the coil of the contactor module is energized, the connection contact of the corresponding contactor module is conductive; the mains power supply device 96, the coil of the contactor 1, the switch module, and the control circuit part of the controller 6 can be connected in series in sequence to form a first loop; when the remaining power in the battery 5 is sufficient to supply power to the power supply part of the controller 6, the battery 5 supplies power to the power supply part of the controller 6, and the controller 6 can control the switch module to close, then the first loop is energized, then the coil of the contactor module is energized, then the connection contact of the contactor module corresponding to the coil of the contactor module is conductive, then the mains power supply device 96 can supply power to the transformer 2, the rectifier circuit 4 converts the alternating current output by the transformer 2 into direct current, and the direct current charges the battery 5, realizing the charging of the battery 5; the voltage acquisition module 91 is used to acquire the real-time voltage across the battery 5, and the controller 6 is used to control the switch module to open when the real-time voltage is greater than the first preset voltage, then the first loop is disconnected, so that the coil of the contactor module corresponding to the switch module is de-energized, then the mains power supply device 96 stops supplying power to the transformer 2, so that the battery 5 stops charging, monitors the voltage during the charging process of the battery 5, avoids the phenomenon of overcharging of the battery 5 caused by too high a voltage on the battery 5 and further thermal runaway, and protects the battery 5.

[0023] Specifically, the battery 5 powers the controller 6, enabling the controller 6 to control the start and stop of the switch module, and further control the start and stop of the contactor module, thereby realizing the control of the charging process of the battery 5. By using the battery 5 as the power source of the controller 6, it is possible to avoid the accidental short-circuit of the charging terminals during non-charging periods due to the exposure of the terminals, which can prevent accidents caused by the accidental short-circuit of the charging terminals after the charger is connected to the high-voltage power supply. In this application, only when the battery 5 is connected to the controller 6 can the controller 6 be started, thereby controlling the closing of the switch module, and further controlling the closing of the wiring contacts of the contactor module. Only then can the transformer 2 have an input and the battery 5 can be charged. If the battery 5 does not supply power to the controller 6, the controller 6 will not start, and it will not be able to control the closing of the switch module. Then the wiring contacts of the contactor module will not close, the transformer 2 will have no input, and the battery 5 cannot be charged. Therefore, even if the charging terminals are accidentally short-circuited during the non-charging time of the battery 5, it will not cause a short-circuit of the charger. The rectifier circuit 4 can be a three-phase uncontrolled rectifier circuit 4, which converts the alternating current output by the transformer 2 into direct current to supply power for charging the battery 5.

[0024] The transformer 2 can be a leakage magnetic transformer.

[0025] Specifically, the output voltage of the leakage magnetic transformer decreases as the output current increases. By setting an appropriate leakage reactance for the leakage magnetic transformer, the charging current corresponding to the voltage level of the battery 5 can be restricted. The transformer 2 is a three-phase leakage magnetic transformer.

[0026] As a safety charger in this embodiment, it can further include a reactive power compensation circuit 3 whose input and output ends are respectively connected to the output end of the transformer 2 and the rectifier circuit 4. The reactive power compensation circuit 3 is used to compensate the reactive power when the transformer 2 transmits alternating current to the rectifier circuit 4.

[0027] As a safety charger in this embodiment, it can further include a sampling resistor 92 connected in series with the battery 5 and a current acquisition module 93 used to acquire the real-time current of the sampling resistor 92. The controller 6 is used to control the disconnection of the switch module when the real-time current is greater than the first preset current, so that the coil of the contactor module corresponding to the switch module is powered off.

[0028] Specifically, since the sampling resistor 92 is connected in series with the battery 5, the real-time current is the same as the input current of the battery 5. By collecting and monitoring the current during the charging process of the battery 5, it is possible to avoid the phenomenon of overcharging the battery 5 due to excessive current on the battery 5, and further prevent the occurrence of thermal runaway, thereby protecting the battery 5.

[0029] As a safety charger in this embodiment, it can further include a fuse protection module 81 used to protect the controller 6. The coil of the contactor module, the switch module, the control circuit part of the controller 6, the mains power supply device 96, and the fuse protection module 81 are connected in series to form a first loop.

[0030] Specifically, the controller 6 controls the switch module, and a fuse protection module 81 is added. When the first loop is short-circuited, the fuse protection module 81 disconnects, thereby protecting the protector. The fuse protection module 81 can be a circuit breaker.

[0031] The contactor module may include multiple contactors 1, and the switch module includes a main control switch 71 and multiple conducting switches 72; the wiring contacts of the multiple contactors 1 are connected to different windings on the transformer 2, so that the transformer 2 outputs voltages of different levels; the multiple conducting switches 72 are respectively connected in series with the coils of the multiple contactors 1 to form multiple first conducting circuits, and the multiple first conducting circuits are connected in parallel to form a second conducting circuit; the second conducting circuit, the main control switch 71, the control circuit part of the controller 6, the fuse protection module 81, and the mains power supply device 96 are connected in series to form a first loop; the multiple conducting switches 72 are arranged corresponding to the coils of the multiple contactors 1, the multiple conducting switches 72 are interlocked, and the wiring contacts of the multiple contactors 1 are interlocked; when the controller 6 is powered on, it controls one conducting switch 72 to close, and the coil of the contactor 1 corresponding to the conducting switch 72 conducts when the main control switch 71 and the fuse protection module 81 are both closed.

[0032] Specifically, when the main control switch 71 and the fuse protection module 81 are both closed, and the controller 6 controls one conducting switch 72 to close, the coil of the contactor 1 connected in series with the conducting switch 72 is powered on, and the wiring contact of the contactor 1 corresponding to the coil of the contactor 1 closes, so that the winding on the transformer 2 connected to the wiring contact of the contactor 1 conducts, and the transformer 2 outputs a voltage of the level corresponding to the winding. The multiple conducting switches 72 are interlocked, that is, the controller 6 can only control one conducting switch 72 to close, and the wiring contacts of the multiple contactors 1 are interlocked, so that only one wiring contact of the contactor 1 can close each time. If the controller 6 changes to control another conducting switch 72 to close, so that the wiring contact of another contactor 1 closes, and another winding of the transformer 2 conducts, realizing the adjustment of the output voltage of the transformer 2, so that the transformer 2 outputs different voltage levels, that is, changing the relationship between the current and voltage at the output end of the transformer 2. The transformer 2 is a three-phase leakage magnetic transformer, and by closing different contactors 1, the turns ratio of the input and output coils of the transformer 2 is changed to realize the output of different voltage levels.

[0033] As a safety charger in this embodiment, it may further include a stop button 82, and the controller 6 is used to control the main control switch 71 to disconnect when the stop button 82 is activated, so that the coils of the contactor module corresponding to the switch module are powered off.

[0034] Specifically, the stop button 82 is designed to manually turn off the charging state of the battery 5. After the charging is completed, the stop button 82 is activated, and the main control switch 71 disconnects, which can completely disconnect the strong electricity, preventing electric shock when personnel perform charging operations and enhancing the protection performance for personnel.

[0035] As a safety charger in this embodiment, it may further include a first temperature acquisition module 97 for acquiring the first real-time temperature of the battery 5, and the controller 6 is used to control the switch module to disconnect when the first real-time temperature is greater than the first preset temperature.

[0036] Specifically, the first temperature acquisition module 97 may be a thermosensitive element, which acquires the temperature of the battery 5 terminal as the temperature of the battery 5. When the temperature exceeds a predetermined safety value, the controller 6 controls the switch module to disconnect, and the battery 5 stops charging. During the charging process of the battery 5, the temperature is monitored to avoid the phenomenon of overcharging of the battery 5 caused by excessive temperature on the battery 5 and further thermal runaway, so as to protect the battery 5.

[0037] As a safety charger in this embodiment, it may further include a varistor 94 connected in parallel with the output terminal of the rectifier circuit 4 to prevent the output voltage of the rectifier circuit 4 from fluctuating.

[0038] Specifically, in order to prevent the voltage fluctuation of the rectifier output, a varistor 94 is added to ensure that the battery 5 terminal provides a stable voltage for the controller 6 as the input power supply.

[0039] As a safety charger in this embodiment, it may further include a second temperature acquisition module for acquiring the second real-time temperature of the transformer 2, and the controller 6 is used to control the switch module to disconnect when the second real-time temperature is greater than the second preset temperature, so that the coil of the contactor module corresponding to the switch module is powered off.

[0040] Specifically, the temperature of the transformer 2 is monitored in real time to avoid damage to the transformer 2 caused by excessive temperature of the transformer 2.

[0041] Specifically, the multiple contactors 1 in this application may include a unit contactor KM1 and a unit contactor KM2, the multiple conduction switches 72 may include a conduction unit switch K1 and a conduction unit switch K2, the main control switch 71 may be a main control unit switch K3, the mains power supply device 96 may be a 380V three-phase power supply, and it may further include a main control panel power supply module 95. Both ends of the main control panel power supply module 95 are respectively connected to the battery 5 and the controller 6. The unit contactors KM1 / KM2 are normally closed unit contactors, and the two wiring methods are interlocked to ensure that they cannot be closed simultaneously. The coils of the unit contactor KM1 and the unit contactor KM2 cannot be closed simultaneously, and the wiring contacts of the unit contactor KM1 and the unit contactor KM2 cannot be closed simultaneously. The conduction unit switches K1 and K2 are interlocked and cannot be closed simultaneously.

[0042] Specifically, the battery 5 supplies power to the controller 6 through the main control panel power supply module 95. After the controller 6 is powered on, it controls one of the conduction unit switches K1 and K2 to be powered on, and one of the coils of the unit contactor KM1 and the coil of the unit contactor KM2 is powered on. As a result, one of the wiring contacts of the unit contactor KM1 and the wiring contacts of the unit contactor KM2 is powered on, then the transformer 2 is powered on, the reactive power compensation circuit 3 and the rectifier circuit 4 are connected in parallel, the varistor 94 and the rectifier circuit 4 are connected in parallel, and the sampling resistor 92 and the rectifier circuit 4 are connected in series. After the charging is completed, when the stop button 82 is pressed, the controller 6 controls the main control switch 71K3 to disconnect, then the first loop is disconnected, and the unit contactor is disconnected to stop charging. By cooperating with the interlock wiring of the conduction unit switches K1 / K2, the transformer 2 outputs different voltage levels, that is, the relationship between the output current and voltage is changed. It can be set to obtain a smaller charging current when the battery 5 is close to full charge to prevent thermal runaway caused by overcharging of the battery 5.

[0043] Specifically, for the charging of the battery 5: fast charging mode -----> trickle charging mode

[0044] First, the voltage across the battery 5 is collected. By controlling different unit contactors through the conduction unit switches K1 / K2, the transformer 2 outputs different voltage levels. The conduction unit switch K1 corresponds to a high voltage level, and the conduction unit switch K2 corresponds to a low voltage level. When the actual voltage reaches the set value, that is, when the battery 5 is close to full charge, the controller 6 controls the conduction unit switch K1 to switch to the conduction unit switch K2, and the rectifier circuit 4 then converts the alternating current output by the transformer 2 into direct current to supply power to the battery 5 for charging. After the three-phase alternating current passes through the filter rectifier circuit 4, it is converted into direct current to charge the battery 5. Different charging modes are selected. When the voltage is low, the fast charging mode is adopted, and when the voltage is high, the trickle charging mode is adopted. When the voltage is higher than the safety set value, the controller 6 stops working. When the current exceeds the set safety value, the controller 6 stops working. When the temperature of the battery 5 exceeds the predetermined safety value, the controller 6 stops working.

[0045] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0046] It should be noted that in the description of this application, the terms "upper end", "lower end", and "bottom end" indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. These are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A safety charger, characterized in that: It includes a contactor module, a transformer (2), a rectifying circuit (4), a battery (5), a controller (6), a voltage acquisition module (91), and a switch module. One end of the wiring contact of the contactor module is electrically connected to the mains power supply device (96), and the other end is electrically connected to the input end of the transformer (2). The wiring contact of the contactor module is used to conduct when the coil of the corresponding contactor module is energized. One end of the rectifying circuit (4) is electrically connected to the output end of the transformer (2), and the other end is electrically connected to the battery (5), which is used to rectify the alternating current transmitted by the transformer (2) into direct current for charging the battery (5). The coil of the contactor module, the switch module, the control circuit part of the controller (6), and the mains power supply device (96) are connected in series to form a first loop. The battery (5) is electrically connected to the power supply part of the controller (6) to supply power to the controller (6). When the controller (6) is energized, it controls the switch module to close, so that the coil of the contactor module corresponding to the switch module is energized. The voltage acquisition module (91) is used to acquire the real-time voltage across the battery (5). The controller (6) is used to control the switch module to disconnect when the real-time voltage is greater than the first preset voltage, so that the coil of the contactor module corresponding to the switch module is de-energized.

2. The safety charger according to claim 1, wherein: The transformer (2) is a leakage magnetic transformer.

3. The safety charger according to claim 1 or 2, characterized in that: It further includes a reactive power compensation circuit (3) whose input end and output end are respectively connected to the output end of the transformer (2) and the rectifying circuit (4). The reactive power compensation circuit (3) is used to compensate the reactive power when the transformer (2) transmits alternating current to the rectifying circuit (4).

4. A safety charger according to claim 1 or 2, characterized in that: It further includes a sampling resistor (92) connected in series with the battery (5) and a current acquisition module (93) used to acquire the real-time current of the sampling resistor (92). The controller (6) is used to control the switch module to disconnect when the real-time current is greater than the first preset current, so that the coil of the contactor module corresponding to the switch module is de-energized.

5. A safety charger according to claim 1 or 2, characterized in that: It further includes a fuse protection module (81) used to protect the controller (6). The coil of the contactor module, the switch module, the control circuit part of the controller (6), the mains power supply device (96), and the fuse protection module (81) are connected in series to form a first loop.

6. The safety charger according to claim 5, wherein: The contactor module includes a plurality of contactors (1), and the switch module includes a main control switch (71) and a plurality of conduction switches (72); the wiring contacts of the plurality of contactors (1) are connected to different windings on the transformer (2) so that the transformer (2) outputs voltages of different levels; the plurality of conduction switches (72) are respectively connected in series with the coils of the plurality of contactors (1) to form a plurality of first conduction circuits, and the plurality of first conduction circuits are connected in parallel to form a second conduction circuit; the second conduction circuit, the main control switch (71), the control circuit part of the controller (6), the fuse protection module (81), and the mains power supply device (96) are connected in series to form a first loop; the plurality of conduction switches (72) are arranged corresponding to the coils of the plurality of contactors (1), the plurality of conduction switches (72) are interlocked, and the wiring contacts of the plurality of contactors (1) are interlocked; when the controller (6) is powered on, it controls one of the conduction switches (72) to close, and the coil of the contactor (1) corresponding to the conduction switch (72) conducts when both the main control switch (71) and the fuse protection module (81) are closed.

7. The safety charger according to claim 6, wherein: It further includes a stop button (82), and the controller (6) is configured to control the main control switch (71) to disconnect when the stop button (82) is activated.

8. A safety charger according to claim 1 or 2, characterized in that: It further includes a first temperature acquisition module (97) for acquiring the first real-time temperature of the battery (5), and the controller (6) is configured to control the switch module to disconnect when the first real-time temperature is greater than the first preset temperature, so that the coil of the contactor module corresponding to the switch module is powered off.

9. The safety charger according to claim 1 or 2, characterized in that: It further includes a varistor (94) connected in parallel with the output terminal of the rectifier circuit (4) for preventing voltage fluctuations in the output voltage of the rectifier circuit (4).

10. A safety charger according to claim 1 or 2, characterized in that: It further includes a second temperature acquisition module for acquiring the second real-time temperature of the transformer (2), and the controller (6) is configured to control the switch module to disconnect when the second real-time temperature is greater than the second preset temperature, so that the coil of the contactor module corresponding to the switch module is powered off.

Images