Charging equipment, charging equipment control method and charging system

Abstract

The invention discloses charging equipment, a charging equipment control method and a charging system. The charging equipment comprises a charging module, a switch module and a control module, the charging module is configured to convert input power into output power; the switch module is connected between the output end of the charging module and the charging port; the control module is configured to execute a battery activation function, including controlling an output voltage and an output current of the charging module to be in a voltage-limiting and current-limiting state, and gradually increasing the output voltage to a rated output voltage; and in response to the output current meeting the first preset condition, controlling the switch module to be in a one-way conduction state so as to prevent the external current from being reversely input to the switch module and / or the charging module. The charging equipment provided by the invention can prevent circuit elements from being damaged when the battery is activated.

Description

Technical Field

[0001] The present application relates to the technical field of electric power equipment, and in particular to a charging device, a charging device control method and a charging system. Background Art

[0002] When the battery pack is under-voltage, the protection board inside the battery pack will cut off the battery's external output. At this time, the voltage at both ends of the battery pack is close to 0V. From a safety perspective, traditional lead-acid chargers need to detect a reasonable battery voltage at the output end before establishing output. As batteries are used more and more widely, chargers with battery activation functions have emerged to meet market demand.

[0003] At present, chargers with battery activation function will normally establish output even if the battery voltage cannot be detected in battery charging mode, so that the battery can be activated normally after the battery undervoltage protection, and then the battery can be charged. However, since there is almost no voltage after the battery undervoltage, when the charger is in battery activation mode, as long as the battery output voltage is within a certain threshold range (for example, 0V ~ battery overvoltage protection threshold), the charger will establish output. However, if the battery in the undervoltage protection state is reversely connected to the charger, or the user reversely connects the charger to the charger after the charger establishes output, it may cause damage to the charger and / or battery, so there is a very large safety hazard. Summary of the invention

[0004] The present application provides a charging device, a charging device control method and a charging system to solve the problem of damage to the charger and the battery that may be caused during the battery activation process in the prior art.

[0005] According to one aspect of the present application, a charging device is provided, characterized in that it includes a charging module, a switch module and a control module;

[0006] The charging module is configured to convert input power into output power;

[0007] The switch module is connected between the output end of the charging module and the charging port;

[0008] The control module is configured to perform a battery activation function including,

[0009] Controlling the output voltage and output current of the charging module to be in a voltage-limited and current-limited state, and gradually increasing the output voltage to a rated output voltage;

[0010] In response to the output current satisfying a first preset condition, the switch module is controlled to be in a unidirectional conduction state to prevent an external current from being reversely input into the switch module and / or the charging module.

[0011] Optionally, the control module is further configured to automatically execute the battery activation function in response to determining that the voltage of the charging port satisfies a second preset condition before executing the battery activation function.

[0012] Optionally, controlling the output voltage and output current of the charging module to be in a voltage and current limiting state includes controlling the output voltage and output current of the charging module according to preset percentages of the rated voltage and rated current of the charging device.

[0013] Optionally, during the execution of the battery activation function, the control module is also configured to periodically obtain the operating parameters of the charging device to determine whether to trigger charging protection, and send protection prompt information and / or exit the battery activation function after determining that charging protection is triggered.

[0014] Optionally, the determining whether to trigger charging protection includes:

[0015] Determining whether to trigger reverse connection protection or overvoltage protection according to the voltage of the charging port;

[0016] Determining whether to trigger overcurrent protection according to the current of the charging port;

[0017] Determining whether to trigger short circuit protection according to the voltage and current of the charging port;

[0018] Determining whether to trigger over-temperature protection or under-temperature protection of the charging device according to the temperature of the charging device;

[0019] Determine whether to trigger over-temperature protection of the charged device or under-temperature protection of the charged device according to the temperature of the charged device connected to the charging device.

[0020] Optionally, the switch module includes a first switch module and a second switch module connected back to back, and the first switch module and the second switch module each include one or more solid-state switches connected in parallel.

[0021] Optionally, controlling the switch module to be in a unidirectional conduction state includes controlling the first switch module to be turned on and the second switch module to be turned off, and the body diode of the second switch module is reverse biased under the action of the external current.

[0022] Optionally, after controlling the switch module to be in a unidirectional conduction state, the control module is also configured to control the charging module to work continuously for a preset period of time and then turn off the output, and in response to determining that the voltage of the charging port meets a third preset condition, exit the battery activation function.

[0023] According to another aspect of the present application, a charging device control method is provided, wherein the charging device comprises a charging module and a switch module, wherein the charging module is configured to convert input power into output power, and the switch module is connected between an output end of the charging module and a charging port; the method comprises:

[0024] Controlling the output voltage and output current of the charging module to be in a voltage-limited and current-limited state, and gradually increasing the output voltage to a rated output voltage;

[0025] In response to the output current satisfying a first preset condition, the switch module is controlled to be in a unidirectional conduction state to prevent an external current from being reversely input into the switch module and / or the charging module.

[0026] According to another aspect of the present application, a charging system is provided, including a charged device and the charging device, wherein the charging device is used to charge the charged device.

[0027] The technical solution of the embodiment of the present application provides a charging device, including a charging module, a switch module and a control module, wherein the charging module is configured to convert input power into output power; the switch module is connected between the output end of the charging module and the charging port; the control module is configured to perform a battery activation function, including controlling the output voltage and output current of the charging module to be in a voltage-limited and current-limited state, and gradually increasing the output voltage to a rated output voltage, wherein controlling the charging module to be in a current-limited and voltage-limited state can avoid excessive output voltage and damage to the battery when a battery of a mismatched model is connected, and in response to the output current satisfying a first preset condition, controlling the switch module to be in a unidirectional conduction state, the first preset condition being that the output current is zero or close to zero, that is, the charging device is not connected to the battery, at this time, controlling the switch module of the charging device to be in a unidirectional conduction state, thereby avoiding the reverse input of the battery current to the switch module and / or the charging module when the external battery is reversely connected, and the charging device provided by the present application can avoid damage to circuit components when the battery is activated, and solves the problem of charger and battery damage that may be caused in the prior art.

[0028] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of a charging device provided in an embodiment of the present application;

[0031] Figure 2 is a circuit diagram of a charging device provided in an embodiment of the present application;

[0032] Figure 3 is a charging protection judgment flow chart provided in an embodiment of the present application;

[0033] Figure 4 This is a flowchart of waiting for protection release provided in an embodiment of the present application;

[0034] Figure 5 is a flowchart of the standby state of the charging device provided in the embodiment of the present application;

[0035] Figure 6 This is a flowchart of power-on initialization of a charging device provided in an embodiment of the present application;

[0036] Figure 7 is a flowchart of battery activation provided by an embodiment of the present application;

[0037] Figure 8 is a flow chart of battery activation current limiting provided by an embodiment of the present application;

[0038] Fig. 9 is an output control flow chart provided in an embodiment of the present application;

[0039] Fig.10 It is a flow chart of battery activation voltage boosting provided in an embodiment of the present application;

[0040] Fig.11 This is a flowchart of the battery activation voltage established in the embodiment of the present application;

[0041] Fig.12 is a flow chart of a charging device control method provided in an embodiment of the present application;

[0042] Fig.13 It is a structural schematic diagram of a charging system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0044] It should be noted that, in this article, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements limited by the sentence "include one ..." do not exclude the existence of other identical elements in the process, method, article or device including the element. It should be further understood that, as used in this article, the singular form "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. Furthermore, the terms "or", "and / or", "include at least one of the following" etc. used in this article can be interpreted as inclusive, or mean any one or any combination. Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, the exception of this definition will occur.

[0045] It should be understood that, although the terms first, second, third, etc. may be used herein to describe various parameters or modules, these parameters or modules should not be limited to these terms. These terms are only used to distinguish parameters or modules of the same type from each other. For example, without departing from the scope of this article, the first parameter may also be referred to as the second parameter, and similarly, the second parameter may also be referred to as the first parameter. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determination" or "in response to detection". Similarly, depending on the context, the phrase "if it is determined" or "if it is detected (statement of the condition or event)" may be interpreted as "when determining" or "in response to determination" or "when detecting (statement of the condition or event)" or "in response to detection (statement of the condition or event)". In addition, the components, features, and elements with the same name in different embodiments of the present application may have the same meaning, or may have different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context in the specific embodiment.

[0046] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0047] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the scope of rights of the present application.

[0048] The present application embodiment provides a charging device, Figure 1 is a schematic diagram of the structure of a charging device provided in an embodiment of the present application, such as Figure 1 As shown, the charging device 100 includes a charging module 110, a switch module 120 and a control module 130; the charging module 110 is configured to convert input power into output power; the switch module 120 is connected between the output end of the charging module 110 and the charging port; the control module 130 is configured to perform a battery activation function, including controlling the output voltage and output current of the charging module 110 to be in a voltage-limited and current-limited state, and gradually increasing the output voltage to a rated output voltage; in response to the output current satisfying a first preset condition, controlling the switch module 120 to be in a unidirectional conduction state to prevent external current from being reversely input into the switch module 120 and / or the charging module 110.

[0049] In this embodiment, the charging device 100 is a device used to charge batteries or other electronic devices. The charging device 100 should at least have the ability to charge lithium-ion batteries (such as iron phosphate batteries, ternary batteries, etc.), but is not limited to this. The charging device 100 can also charge other types of rechargeable batteries (such as lead-acid batteries, nickel metal batteries, etc.).

[0050] The charging module 110 is the core module of the charging device 100, which is used to output stable charging power after power conversion of the input power. According to the different types of input power of the charging device 100, different power conversion circuits can be used as the charging module 110. For example, the input source can be divided into DC input and AC input. Typical DC input sources include solar cells, batteries, etc., and AC input sources include AC power grids, AC generators, etc. Correspondingly, the charging module 110 can use a DC-DC converter, an AC-DC converter, a DC-AC-DC converter, etc. The output power of the charging module 110 should be adapted to the battery type and charging requirement parameters of the charged device, and its output power should generally be DC output power.

[0051] The switch module 120 is a module for controlling the charging and discharging of the charging device 100 according to the received switch signal, and includes a switch element, etc. The control module 130 is a module for processing data according to a predetermined program or external input and outputting a control signal, for example, the control module 130 includes a single chip microcomputer, a microprocessor, etc.

[0052] In this embodiment, the charging port includes a charging port positive pole OUT+ and a charging port negative pole OUT-, the charging port is connected to the battery, and the switch module 120 is connected between the output end of the charging module 110 and the charging port positive pole OUT+, or, the switch module 120 is connected between the output end of the charging module 110 and the charging port negative pole OUT-.

[0053] After the control module 130 is configured to perform the battery activation function, the control module 130 controls the output voltage of the charging module 110 to be in a voltage-limited state, controls the output current of the charging module 110 to be in a current-limited state, and first establishes the output with a smaller voltage and current to avoid battery damage due to the mismatch between the voltage level of the connected battery and the rated output of the charging device. Generally speaking, the output voltage and output current after voltage and current limiting should be much smaller than the rated output voltage and current of the charging device 100. In the process of establishing voltage and current limiting output, it can be determined whether the charging device 100 triggers charging protection, and the input and output parameters of the charging device are obtained by sampling the hardware circuit of the charging device 100 to determine whether it is higher or lower than a preset threshold (which can be a hardware threshold or a software threshold), and after the charging protection is triggered, a level change signal is generated to the control module 130 of the charging device 100, and the control module 130 will immediately suspend the output after receiving this interrupt signal, thereby realizing charging protection.

[0054] If the charging protection is not triggered during the voltage and current limiting output process, the output voltage of the charging module 110 is controlled to gradually increase to the rated output voltage, thereby trying to establish a battery activation voltage signal at the charging port. In this process, the output current of the charging module 110 is maintained unchanged so that it continues to be in a current limiting state. At the same time, the operating parameters of the charging device 100 are periodically obtained to determine whether the charging protection is triggered to avoid abnormal conditions due to battery reverse connection, short circuit, overvoltage, overcurrent, overtemperature, etc.

[0055] When the output voltage of the charging module 110 reaches the rated output voltage, if the charging device 100 is correctly connected to the battery at this time, the battery should be normally activated under the effect of the output voltage. However, if the charging device 100 is not connected to the battery at this time, since the charging device 100 has established output, the user should avoid mistakenly connecting the battery to the charging device 100 at this moment. Because, at this time, once the battery and the charging device 100 are reversely connected, or the rated voltage of the battery does not match the rated output voltage of the charging device 100, it is very likely that the battery current will flow back into the charging device 100 and cause damage to the charging device. Therefore, when the control module 130 determines that the output current of the charging module 110 satisfies the first preset condition, it is considered that the possible reason is that the charging module 110 is not connected to the battery, wherein the first preset condition is that the output current of the charging module 110 is zero or a current value close to zero, and the control module 130 controls the switch module 120 to be in a unidirectional conduction state. At this time, if the battery is connected, the battery current can be prevented from being reversely input to the switch module 120 and / or the charging module 110, thereby avoiding the risk of damage to the charging device in the battery activation mode.

[0056] The technical solution of this embodiment provides a charging device, including a charging module, a switch module and a control module. The charging module is configured to convert input power into output power; the switch module is connected between the output end of the charging module and the charging port; the control module is configured to perform a battery activation function, including controlling the output voltage and output current of the charging module to be in a voltage-limited and current-limited state, and gradually increasing the output voltage to a rated output voltage, wherein controlling the charging module to be in a current-limited and voltage-limited state can avoid excessive output voltage and damage to the battery when a battery of a mismatched model is connected, and in response to the output current satisfying a first preset condition, controlling the switch module to be in a unidirectional conduction state, the first preset condition being a value close to zero, that is, the charging device is not connected to the battery, at this time, the switch module is in a unidirectional conduction state, which can avoid the problem that when the battery is mistakenly connected externally, the battery current is reversely input to the switch module and / or the charging module, thereby causing damage to the charger and the battery. The charging device provided by this embodiment has higher stability, safety and life, and a more user-friendly experience.

[0057] On the basis of the above embodiment, the switch module 120 includes a first switch module and a second switch module connected back to back, and the first switch module and the second switch module each include one or more solid-state switches connected in parallel, wherein a plurality of solid-state switches connected in parallel can enhance the current conduction capability and reduce the heat generation and loss of the switch module. Among them, the solid-state switch is a new type of electronic switching device composed of solid-state electronic components. For example, the solid-state switch includes a switch triode, a MOSFET, an IGBT, a GaN transistor, etc. The back-to-back connection refers to a connection method in which the solid-state switch in the first switch module and the solid-state switch in the second switch module are connected in series back to back. Taking the MOS tube as an example, the source electrodes of the two MOS tubes are connected to each other, or the drain electrodes of the two MOS tubes are connected to each other. Due to the presence of a body diode in the MOS tube, the back-to-back connection method can realize the bidirectional controllable flow of current in the charging device, and also provides a hardware basis for preventing current backflow.

[0058] Exemplarily, controlling the switch module 120 to be in a unidirectional conduction state includes controlling the first switch module to be turned on and the second switch module to be turned off, and the body diode of the second switch module is reverse biased under the action of the external current. Figure 2 is a circuit diagram of a charging device provided in an embodiment of the present application, such as Figure 2 As shown, the first switch module includes a first MOS transistor Q1, and the second switch module 130 includes a second MOS transistor Q2. The source of the first MOS transistor Q1 is connected to the output end of the charging module 110, the drain of the first MOS transistor Q1 is connected to the drain of the second MOS transistor Q2, the source of the second MOS transistor Q2 is connected to the positive electrode OUT+ of the charging port, and the gate of the first MOS transistor Q1 and the gate of the second MOS transistor Q2 are connected to the control module 130. When the output current of the charging module 110 meets the first preset condition, the control module 130 determines that the charging module 110 may not be connected to the battery, and the control module 130 controls the first MOS transistor Q1 to turn on and the second MOS transistor Q2 to turn off. At this time, if the battery is connected, the second MOS transistor Q1 uses its own body diode to unidirectionally transmit the charging current output by the charging module to the charging port, while preventing the battery current from being reversely input to the switch module 120 and / or the charging module 110.

[0059] Referring to the above embodiment, during the entire process of executing the battery activation function, the control module 130 is also configured to periodically obtain the operating parameters of the charging device to determine whether to trigger charging protection, and send a protection prompt message and / or exit the battery activation function after determining that charging protection is triggered.

[0060] In this embodiment, when the battery activation function is executed, the voltage and current output by the charging module 110 are respectively output from the voltage limiting state and the current limiting state to the rated state. During the voltage and current rising process, the control module 130 periodically obtains the operating parameters of the charging device to determine whether to trigger the charging protection, wherein the operating parameters include current, voltage, temperature and other parameters. According to the performance of the control module 130 adopted, different detection cycles can be set. The cycle is usually short, such as 50us, so that the entire control module 130 will reach a measurement and control frequency of 20K, which can ensure the real-time performance of the control module 130. The charging device 100 needs to continuously adjust whether it needs to increase power, reduce power, or maintain power according to the input and output voltage and current, and determine whether it needs to trigger the corresponding charging protection according to the measured voltage, current, and temperature values, until charging stops (the user removes the input or output, or the charging conditions are not met at present) or is completed (after the battery is fully charged). Triggering charging protection means that the monitored operating parameters exceed the preset safe operating parameter range. When the operating parameters of the charging equipment exceed the preset safe operating parameter range, the control module 130 exits the battery activation function and may also send a protection prompt message. For example, the control module 130 is connected to an alarm device or an intelligent electronic device, the alarm device outputs an alarm signal, and the application App of the intelligent electronic device displays a prompt message corresponding to the triggered charging protection type to avoid abnormal charging equipment operating parameters due to special conditions during the battery activation process.

[0061] Specifically, judging whether to trigger charging protection includes: determining whether to trigger reverse connection protection or overvoltage protection according to the voltage of the charging port; determining whether to trigger overcurrent protection according to the current of the charging port; determining whether to trigger short circuit protection according to the voltage and current of the charging port; determining whether to trigger over-temperature protection or under-temperature protection of the charging device according to the temperature of the charging device; determining whether to trigger over-temperature protection or under-temperature protection of the charged device according to the temperature of the charged device connected to the charging device.

[0062] For example, Figure 3 is a charging protection judgment flow chart provided in an embodiment of the present application, such as Figure 3As shown, the control module 130 performs input reverse connection protection when it determines that the voltage at the input end of the charging device is reversely connected. For example, the input power of the charging device can be direct current generated by photovoltaic power generation, alternating current, etc. When the control module 130 determines that the voltage at the input end of the charging device is negative, it determines that the input source of the charging device is reversely connected to the charging device 100. The control module 130 performs input overvoltage protection when it determines that the voltage at the input end of the charging device is overvoltage. For example, when the voltage of the solar cell as the input source exceeds the rated input voltage range of the charging device 100, the corresponding input overvoltage protection should be performed. The control module 130 performs battery reverse connection protection when it determines that the voltage at the charging port is reversely connected, and performs battery overvoltage protection when it determines that the voltage at the charging port is overvoltage. The control module 130 determines whether the current of the charging port is close to 0. If not, it returns to current measurement abnormality protection (detection when the charging device is not charging), and determines whether the current of the charging port is overcurrent. If so, it returns to current overcurrent protection (real-time detection of charging of the charging device). The control module 130 determines whether the battery temperature is over-temperature, and if so, returns the battery over-temperature protection; determines whether the battery temperature is under-temperature, and if so, returns the battery under-temperature protection. The control module 130 determines whether the charging device temperature is over-temperature, and if so, returns the charging device over-temperature protection; whether the charging device temperature is under-temperature, and if so, returns the charging device under-temperature protection.

[0063] On the basis of the above embodiment, the battery activation function is exited after it is determined that the charging protection is triggered, and the battery activation function is continued to be executed after the protection is released. Figure 4 is a flowchart of waiting for protection release provided in an embodiment of the present application, such as Figure 4 As shown, the control module 130 periodically measures the voltage, current and temperature related data of the charging device. If there is "input reverse connection protection", repeat the above steps until the input voltage is not reversed; if there is "input overvoltage protection", repeat the above steps until the input voltage is not overvoltage; if there is "battery reverse connection protection", repeat the above steps until the battery is not reversed; if there is "battery overvoltage protection", repeat the above steps until the battery is not overvoltage; if there is "current measurement abnormal protection", repeat the above steps until the current measurement is basically 0; if there is "current overcurrent protection", repeat the above steps until the current measurement is basically 0; if there is "battery overtemperature protection", repeat the above steps until the battery is not overheated; if there is "battery undertemperature protection", repeat the above steps until the battery is not undertemperature; if there is "charging device overtemperature protection", repeat the above steps until the charger is not overheated; if there is "charging device undertemperature protection", repeat the above steps until the charging device is not undertemperature; after the above steps are executed, exit the process and return to protection release.

[0064] Optionally, based on the above embodiment, the control module 130 is further configured to automatically execute the battery activation function in response to determining that the voltage of the charging port meets the second preset condition before executing the battery activation function. The second preset condition refers to that the voltage of the charging port is an invalid voltage, that is, the voltage of the charging port is between 0V and the lowest effective voltage of the battery to be activated. At this time, it can be considered that the charging port of the charging device 100 is not connected to a battery, or the battery connected to the charging port is in a dormant state. In this case, the control module 130 of the charging device 100 automatically executes the electric activation function to try to wake up the battery to establish normal charging.

[0065] Specifically, the control module 130 is configured to execute the charging standby working process of the charging device before executing the battery activation function. Figure 5 is a flowchart of the charging device standby operation provided by the embodiment of the present application, such as Figure 5 As shown, the control module 130 measures the voltage, current and temperature of the charging device at a preset cycle; the control module 130 makes a charging protection judgment based on the voltage, current and temperature of the charging device; when it is judged that charging protection is needed, the control module 130 waits for the battery charging protection to be released; when it is judged that charging protection is not needed (everything is normal), the control module 130 judges whether there is a valid input voltage, and if there is no valid input voltage, the control module 130 continues to measure the voltage, current and temperature of the charging device at a preset cycle. The control module 130 judges whether there is a change in the input voltage and output voltage of the charging device; if it is judged that there is a change in the input voltage and output voltage of the charging device, the control module 130 continues to measure the voltage, current and temperature of the charging device at a preset cycle; if it is judged that the input voltage and output voltage remain unchanged within the preset time, it means that the input and output voltages of the charging device are stable at this time, and the input and output voltage values ​​obtained at this time are accurate. The control module 130 determines the voltage of the charging port. If the voltage of the charging port is an invalid voltage (i.e., the voltage of the charging port is between 0V and the minimum effective voltage of the battery), it jumps to the battery activation workflow. If the voltage of the charging port is a valid voltage (the voltage of the charging port is between the minimum effective voltage of the battery and the charging protection voltage), it enters the lithium battery charging workflow. Among them, taking a lithium iron phosphate battery with a rated voltage of 12.8V as an example, as long as the battery is in an activated state, no matter how much power is left, it has a certain effective voltage, and the range of the effective voltage is roughly in the range of 10V to 13.8V. Therefore, if it is detected that the voltage of the charging port is significantly less than the effective voltage range, it means that the battery is not activated or the charging device is not connected to the battery, so it automatically enters the battery activation workflow.

[0066] Optionally, based on the above embodiment, the control module 130 needs to power on and initialize the charging device 100 before executing the charging standby workflow of the charging device 100 . Figure 6 is a flowchart of power-on initialization of a charging device provided in an embodiment of the present application, such as Figure 6 As shown, after the charging device 100 is started, each functional module is initialized first, and then the current battery type is read from the storage area, and the corresponding charging parameter threshold is loaded according to the battery type to judge the rationality of the charging parameters (that is, the charging voltage and current parameters will be judged to see whether they are within the factory setting range). If the parameters are reasonable, the charging parameters in the storage area are used; if the parameters are unreasonable, the factory default parameters are used to enter the battery charging standby workflow.

[0067] On the basis of the above embodiments, the control module 130 controls the output voltage and output current of the charging module 110 in a voltage-limited and current-limited state, including controlling the output voltage and output current of the charging module 110 according to preset percentages of the rated voltage and rated current of the charging device. For example, the voltage output by the charging module 110 in the voltage-limited state does not exceed 10% of the output rated voltage, and the current output by the charging module 110 in the voltage-limited state does not exceed 10% of the output rated current. The voltage and current values ​​output by the charging module 110 are greatly reduced, which can avoid battery damage caused by the mismatch between the voltage level of the connected battery and the rated output of the charging device (such as the rated voltage of the battery is less than the rated voltage of the charging device).

[0068] For example, Figure 7 This is a flowchart of battery activation provided by an embodiment of the present application, such as Figure 7 As shown, the entire battery activation process can be divided into three processes: the battery activation voltage establishment voltage and current limiting stage, the battery activation voltage boost stage, and the battery activation voltage establishment completion stage.

[0069] In the process of establishing the voltage and current limiting stage of the battery activation voltage, if there is charging protection during the process, the process of waiting for the protection to be released is entered; if it fails, the process of waiting for the battery charging standby state is entered. In the process of increasing the battery activation voltage, if there is charging protection during the process, the process of waiting for the protection to be released is entered; if it fails, the process of waiting for the battery charging standby state is entered. In the process of establishing the battery activation voltage completion stage, if there is charging protection during the process, the process of waiting for the protection to be released is entered; if the activation is successful, the activation process is exited and the normal battery charging process is entered. With reference to the above embodiments, in the stage of establishing the battery activation voltage, it is necessary to prevent the battery from being reversely connected to the charging device 100 after under-voltage sleep, or the voltage of the battery and the charging device 100 does not match and backflow occurs, so the method of limiting voltage and current and gradually increasing the voltage is adopted.

[0070] Figure 8 : is a flow chart of the battery activation voltage establishment voltage and current limiting stage provided in the embodiment of the present application, such as Figure 8 As shown, the target voltage and current output by the charging device are set to smaller values ​​(usually much smaller than the rated output voltage and current, for example, 10% of the output voltage and current can be selected). The control module detects the voltage, current, and temperature of the charging device, performs the charging protection judgment process, and then enters the output control process. After the power adjustment is completed, the timing is performed. If the timing times out, it returns failure and exits the process; if the output voltage does not reach the set value, then repeat the above steps. If the output voltage reaches the set value, the current limiting stage process of battery activation is completed.

[0071] The output control process is a process of adjusting the output power of the charging module 110 according to the input and output current and power of the current charging device. Fig. 9 is an output control flow chart provided by the embodiment of the present application. Fig. 9 As shown, if the input voltage is lower than or equal to the minimum input voltage allowed by the charging device, the power is reduced and the process is exited; if the output current of the charging device is higher than the set output target current, the power is reduced and the process is exited; if the output voltage of the charging device is higher than the set output target voltage, the power is reduced and the process is exited; if the output current and voltage of the charging device are both the set current and voltage values, the power remains unchanged and the process is exited; if the output current or voltage of the charging device is less than the set current or voltage, the power is increased and the process is exited.

[0072] Fig.10 is a flow chart of battery activation voltage boost provided by an embodiment of the present application, such as Fig.10 As shown, the target voltage is set to the rated output voltage, the control module periodically measures the voltage, current, and temperature of the charging device, and makes a charging protection judgment, the control module enters the output control process, and starts timing after completing the power adjustment. If the timing times out, it returns failure and exits the process. If the output voltage of the charging device does not reach the set value, repeat the above steps. If the output voltage reaches the set value, the process of the battery activation voltage establishment phase is completed.

[0073] Referring to the above embodiment, the control module 130 controls the switch module 120 to be in a unidirectional conduction state in response to the output current satisfying the first preset condition. After controlling the switch module 120 to be in the unidirectional conduction state, the control module 130 is also configured to control the charging module 110 to continue working for a preset period of time and then turn off the output, and exit the battery activation function in response to determining that the voltage of the charging port satisfies the third preset condition.

[0074] For example, Fig.11: is a flowchart of the battery activation voltage establishment completed according to the embodiment of the present application, such as Fig.11 As shown, the control module 130 periodically performs voltage, current, temperature measurement and charging protection judgment process. After the charging module 110 continues to work for a preset period of time, if the output current is always very small, only the discharge MOS (i.e., the second MOS tube Q2 in the above embodiment, the charging module charges the battery, and the battery cannot reversely supply power to the charging module) is turned on. When a negative pressure is detected in the charging port, the output is suspended. At this time, the user may connect the battery to the charging port in reverse. Since the battery cannot reversely supply power to the charging module, a discharge circuit cannot be formed, and the protection of the battery and the charging device is achieved. The process is exited and the output reverse connection protection is returned. When an overvoltage is detected in the charging port, the output is suspended, the process is exited, and the output overvoltage protection is returned. If the output is overcurrent (the output may be short-circuited) and the voltage at the output end is relatively small (lower than the undervoltage protection threshold of the battery), the output is suspended, the process is exited, the output short-circuit protection is returned, and the output control process is entered. If the charging current is greater than the preset threshold, the output target current is set to the rated value. If the output current is relatively large and the output voltage is the rated value, it indicates that there is a resistive load connected externally, that is, the battery is in a low-temperature heating state. At this time, the charging device maintains this state and repeats the above steps. If the output current is the rated value and the output voltage is within the normal voltage range of the battery, the charging module 110 continues to work for a preset period of time, pauses the output, and measures the voltage of the charging port again. If the voltage is within the normal voltage range of the battery (that is, it meets the third preset condition), the activation is successful and the process is exited. Otherwise, the above steps are repeated. Among them, taking a lithium iron phosphate battery with a rated voltage of 12.8V as an example, the normal voltage range is roughly in the range of 10V to 13.8V. After pausing the output, the charging device can still detect that the voltage of the charging port is within the normal voltage range of the battery, which means that the battery has been activated and can enter the normal charging process.

[0075] An embodiment of the present application also provides a charging device control method, where the charging device includes a charging module and a switch module, where the charging module is configured to convert input power into output power, and the switch module is connected between an output end of the charging module and a charging port. Fig.12 is a flow chart of a charging device control method provided in an embodiment of the present application, such as Fig.12 As shown, the method includes:

[0076] S110, controlling the output voltage and output current of the charging module to be in a voltage-limited and current-limited state.

[0077] Among them, the output voltage and output current of the charging module are in the voltage and current limiting state, and can be set so that the voltage output by the charging module 110 in the voltage limiting state does not exceed 10% of the output rated voltage, and the current output by the charging module 110 in the voltage and current limiting state does not exceed 10% of the output rated current. By setting the output voltage and output current of the charging module in the voltage and current limiting state, the initial value of the voltage and current output by the charging module can be reduced, thereby avoiding battery damage due to the rated voltage of the connected battery being lower than the rated voltage of the charging device.

[0078] S120, gradually increase the output voltage to the rated output voltage.

[0079] If the charging protection is not triggered during the voltage and current limiting output process, the output voltage of the charging module 110 is controlled to gradually increase to the rated output voltage, thereby trying to establish a battery activation voltage signal at the charging port. In this process, the output current of the charging module 110 is maintained unchanged so that it continues to be in a current limiting state. At the same time, the operating parameters of the charging device 100 are periodically obtained to determine whether the charging protection is triggered to avoid abnormal conditions due to battery reverse connection, short circuit, overvoltage, overcurrent, overtemperature, etc.

[0080] S130. In response to the output current satisfying the first preset condition, control the switch module to be in a unidirectional conduction state to prevent the external current from being reversely input into the switch module and / or the charging module.

[0081] In this embodiment, in response to the output current satisfying the first preset condition, the switch module is controlled to be in a unidirectional conduction state, and the first preset condition is a value of zero or close to zero, that is, the charging device is not connected to the battery, and at this time, the switch module is in a unidirectional conduction state. If the charging device is suddenly and mistakenly connected to the battery at this time, the battery current can be prevented from being reversely input to the switch module 120 and / or the charging module 110, thereby avoiding the risk of damage to the charging device in the battery activation mode.

[0082] The charging device control method provided in this embodiment is executed by the charging device in the above embodiment, which improves the stability, safety and life of the charging device. In the battery activation mode, the charging device can avoid the safety hazards caused by the user connecting the wrong battery.

[0083] The embodiment of the present application also provides a charging system, Fig.13 is a schematic diagram of a charging system provided in an embodiment of the present application, such as Fig.13As shown, the charging system 10 includes a charged device 11 and a charging device 100, and the charging device 100 is used to charge the charged device 11. The charged device 11 refers to a device that needs an external power source to charge. These devices usually have built-in batteries and need to be charged by an external power source to maintain their operation. The charging device 100 in any of the above embodiments is applied to the charging system 10, so that the charging system provided by this embodiment has the beneficial effects of the charging device 100 provided in any of the above embodiments.

[0084] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0085] In the present application, the same or similar terminology concepts, technical solutions and / or application scenario descriptions are generally described in detail only the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of the present application, for the same or similar terminology concepts, technical solutions and / or application scenario descriptions that are not described in detail later, reference can be made to the previous related detailed descriptions.

[0086] In the present application, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] The various technical features of the technical solution of the present application can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0088] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as above, and includes a number of instructions for a terminal device (which can be an electrical device or a network device, etc.) to execute the method of each embodiment of the present application.

[0089] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A charging device, characterized in that: It includes a charging module, a switch module and a control module; The charging module is configured to convert input power into output power; The switch module is connected between the output end of the charging module and the charging port; The control module is configured to perform a battery activation function including, Controlling the output voltage and output current of the charging module to be in a voltage-limited and current-limited state, and gradually increasing the output voltage to a rated output voltage; In response to the output current satisfying a first preset condition, the switch module is controlled to be in a unidirectional conduction state to prevent an external current from being reversely input into the switch module and / or the charging module.

2. The charging device according to claim 1, characterized in that: The control module is further configured to automatically execute the battery activation function in response to determining that the voltage of the charging port satisfies a second preset condition before executing the battery activation function.

3. The charging device according to claim 1, characterized in that: Controlling the output voltage and output current of the charging module in a voltage and current limiting state includes controlling the output voltage and output current of the charging module according to preset percentages of the rated voltage and rated current of the charging device.

4. The charging device according to any one of claims 1 to 3, characterized in that: During the execution of the battery activation function, the control module is also configured to periodically obtain the operating parameters of the charging device to determine whether to trigger charging protection, and send protection prompt information and / or exit the battery activation function after determining that charging protection is triggered.

5. The charging device according to claim 4, characterized in that: The determining whether charging protection is triggered includes: Determining whether to trigger reverse connection protection or overvoltage protection according to the voltage of the charging port; Determining whether to trigger overcurrent protection according to the current of the charging port; Determining whether to trigger short circuit protection according to the voltage and current of the charging port; Determining whether to trigger over-temperature protection or under-temperature protection of the charging device according to the temperature of the charging device; Determine whether to trigger over-temperature protection of the charged device or under-temperature protection of the charged device according to the temperature of the charged device connected to the charging device.

6. The charging device according to any one of claims 1 to 3, characterized in that: The switch module includes a first switch module and a second switch module connected back to back, and each of the first switch module and the second switch module includes one or more solid-state switches connected in parallel.

7. The charging device according to claim 6, characterized in that: The controlling the switch module to be in a unidirectional conduction state includes controlling the first switch module to be turned on and the second switch module to be turned off, and the body diode of the second switch module is reverse biased under the action of the external current.

8. The charging device according to any one of claims 1 to 3, characterized in that: After controlling the switch module to be in a unidirectional conduction state, the control module is also configured to control the charging module to turn off the output after continuously working for a preset period of time, and exit the battery activation function in response to determining that the voltage of the charging port meets a third preset condition.

9. A charging device control method, characterized in that: The charging device comprises a charging module and a switch module, wherein the charging module is configured to convert input power into output power, and the switch module is connected between an output end of the charging module and a charging port; the method comprises: Controlling the output voltage and output current of the charging module to be in a voltage-limited and current-limited state, and gradually increasing the output voltage to a rated output voltage; In response to the output current satisfying a first preset condition, the switch module is controlled to be in a unidirectional conduction state to prevent an external current from being reversely input into the switch module and / or the charging module.

10. A charging system, characterized in that: The invention comprises a charged device and a charging device as claimed in any one of claims 1 to 8, wherein the charging device is used to charge the charged device.

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