Charging system and charging method for preventing sparking of charging plug

Abstract

The invention discloses a charging system for preventing a charging plug from sparking, which comprises a generator set and a storage battery, and is characterized in that the output end of the generator set is connected with the storage battery through a controllable rectification unit and a filter capacitor; wherein the device further comprises an output control part, the output control part is connected with the generator set and the storage battery, and when the voltage of the generator set and the voltage of the storage battery end tend to be consistent, the output control part controls the electric connection between the generator set and the storage battery to be conducted. According to the invention, when the storage battery is connected with the output end of the generator set, the voltage of the generator set end and the storage battery end is detected through the voltage detection circuit, and when a large voltage difference exists between the generator set end and the storage battery end, the pre-charging current is started or the output of the generator set is adjusted, so that the voltage of the generator set end tends to be consistent with the voltage of the storage battery end; and then the charging circuit is switched on, so that the burning loss of components or a plug caused by ignition when the charging plug is connected is avoided, the service life of the charging plug can be prolonged, and the reliability of a charging system is improved.

Description

Technical Field

[0001] The present invention relates to a charging system, and in particular to a charging system and a charging method for preventing a charging plug from igniting. Background Art

[0002] As the application of energy storage products becomes more and more widespread, products for charging energy storage batteries are also becoming more and more common. Battery charging ultimately requires DC input, so DC generators came into being.

[0003] In the general machinery sector, DC generators are widely used to charge lead-acid batteries. Existing products generally utilize bridge rectifiers or thyristor-controlled rectifiers before connecting directly to the battery. To ensure the ripple of the AC power generated by the magneto is sufficient for charging after conversion to DC, capacitors are commonly used in the control unit for filtering. Consequently, when the charging device is connected to the positive and negative terminals of the battery, sparks are common, posing a risk of damage to the charging plug. The transient high current surge can also significantly impact the components within the control unit and the battery being charged, posing a potential safety hazard.

[0004] To solve the charging and ignition problem, existing solutions generally adopt the method of controlling the switch through a communication protocol between the charged battery. For example, when charging new energy vehicles, this solution requires built-in communication protocols inside the battery and the charging device, which increases additional circuit costs. The versatility of the product is also affected by the limitation that the communication protocols between some manufacturers are not universal.

[0005] Chinese patent document CN117445667A discloses a two-wheeled vehicle charging anti-spark device, which includes an LLC rectifier circuit, wherein the input end of the LLC rectifier circuit is connected to the mains power, the positive output end of the LLC rectifier circuit is electrically connected to the main circuit control bypass, the output end of the main circuit control bypass is electrically connected to the positive output end of the charger, and the negative output end of the LLC rectifier circuit is electrically connected to the negative output end of the charger; a pre-charging circuit is connected in parallel to the main circuit control bypass, the pre-charging circuit includes: a first transistor and a current limiting resistor, the first transistor and the current limiting resistor are connected in series, and the base of the first transistor is electrically connected to the charger MCU; the charger MCU controls the on and off of the circuit by controlling the opening and closing of the MOSFET in the main circuit control bypass; the battery charging input end is electrically connected to the controller power supply input end, the positive end of the battery charging input end is electrically connected to the wake-up detection circuit, and the output end of the wake-up detection circuit is electrically connected to the battery MCU. This prior art uses a pre-charging circuit and a slow-running detection circuit in conjunction with CAN communication to achieve switching between low-power and full-power supply, thus avoiding sparking when the charger is plugged in. However, this prior art is relatively complex, and requires switching between low-power and full-power charging during the charging process to ensure charging efficiency, which complicates the charging operation. Summary of the Invention

[0006] In order to solve the technical problem of complicated charging operation in the prior art, the present invention provides a charging system that prevents the charging plug from igniting, including a generator set and a battery, and the output end of the generator set is connected to the battery through a controllable rectifier unit and a filter capacitor; wherein: it also includes an output control unit, the output control unit is connected to the generator set and the battery respectively, and when the voltage of the generator set and the battery end tend to be consistent, the output control unit controls the electrical connection between the generator set and the battery to be turned on.

[0007] In the prior art, to prevent the charging plug from sparking due to the instantaneous high current when the charger is inserted, a low-power charging method is used in the early stages of charging to avoid sparking. However, this method is complex in structure, and to ensure charging efficiency, it is necessary to switch to a full-power charging state in a timely manner, which complicates the charging operation. In contrast, in this solution, the voltages at the generator set and the battery terminals are detected, and the electrical connection between the generator set and the battery is controlled only when the voltages at the generator set and the battery terminals are consistent. Because the voltages at the generator set and the battery terminals are consistent, the voltage difference between the generator set and the battery is small or even non-existent, which can avoid sparking caused by a large voltage difference. The operation is simple and the service life of the charging plug is extended.

[0008] Preferably, the output control unit includes an on-off switch for conducting or disconnecting the electrical connection between the generator set and the battery. The on-off switch is kept in an off state by default, and the electrical connection between the generator set and the battery is disconnected. Voltage detection circuit, used to detect the voltage of the generator set and battery; When the main control CPU and the voltage detection circuit detect that the voltages at the generator set and the battery end are tending to be consistent, the main control CPU controls the on-off switch to be turned on, and the electrical connection between the generator set and the battery is turned on.

[0009] This solution can determine whether the voltages of the generator set and the battery terminal are consistent, and realize the conduction of the electrical connection between the generator set and the battery when the voltages of the generator set and the battery terminal are consistent.

[0010] Preferably, when the voltage detection circuit detects a large voltage difference between the generator set and the battery terminal, the output control unit adjusts the voltage of the generator set or the battery terminal until the voltage of the generator set and the battery terminal tend to be consistent, and the structure is simple.

[0011] Preferably, the output control unit includes a feedback regulation unit communicatively connected to the generator set. When the generator set terminal voltage is inconsistent with the battery terminal voltage, the feedback regulation unit adjusts the generator set output voltage to be equivalent to the battery terminal voltage. This solution can regulate the generator set output voltage to ensure that the generator set voltage is equivalent to the battery voltage to avoid sparking, and has a simple structure.

[0012] Preferably, the output control unit also includes a pre-charge circuit. When the generator terminal voltage is lower than the battery terminal voltage, the main control CPU controls the pre-charge circuit to charge the filter capacitor. This solution can limit the charging current and prevent transient high current shocks from causing significant damage to the battery or main control CPU.

[0013] Preferably, the output control unit controls the generator set to start when the voltage detection circuit detects that the battery is low on power; and controls the generator set to stop when the voltage detection circuit detects that the battery is fully charged. This solution enables automatic start and stop of the generator set and is easy to operate.

[0014] Preferably, when the voltage detection circuit detects a battery depletion, the output control unit sends a start command to the pre-charging circuit. Upon receiving the start command, the pre-charging circuit supplies power to the generator set to start the generator set. This solution utilizes the pre-charging circuit to reversely provide power to start the generator set, eliminating the need for an additional power source to start the generator set and resulting in a simple structure.

[0015] Preferably, the generator set is controlled to shut down when the main control CPU detects that the mains power is supplied. This solution can realize the automatic shutdown function of the generator set when the mains power is supplied, thereby avoiding the repeated generation of power by the generator set.

[0016] In a second aspect, the present invention provides a charging method for preventing a charging plug from igniting, using any of the above-mentioned charging systems for preventing a charging plug from igniting.

[0017] The present invention has the following beneficial effects: 1. In the present invention, when the battery is connected to the output end of the generator set, the voltage at the generator set end and the battery end is first detected by the voltage detection circuit. When there is a large voltage difference between the generator set end and the battery end, the pre-charge current is turned on or the generator set output is adjusted to make the voltage at the generator set end and the battery end tend to be consistent, and then the charging line is connected, thereby avoiding ignition and burning of components or plugs when connecting the charging plug, extending the service life of the charging plug, and improving the reliability of the charging system.

[0018] 2. The present invention can reversely provide starting power to the generator set through the pre-charging circuit, and can also realize the automatic start and stop function by detecting the battery terminal voltage through the voltage detection circuit; the present invention can also be connected to the mains power, and can determine whether the generator set needs to be started for emergency charging and energy replenishment by detecting the mains power.

[0019] 3. The present invention can be used as a backup emergency charging device for energy storage battery scenarios such as new energy vehicle energy storage batteries or base station energy storage batteries. It can realize the functions of automatic start-up after the battery is low on power, and automatic shutdown when the battery is charged to a certain stage or when the mains power is turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a charging system in an embodiment of a charging system and a charging method for preventing a charging plug from igniting according to the present invention. DETAILED DESCRIPTION

[0021] The following is further described in detail through specific implementation methods: 1. Definition Generator set: A generator set is a complete set of mechanical equipment that converts other forms of energy into electrical energy. It consists of a power system, control system, silencer system, shock absorption system, and exhaust system. It is driven by a turbine, steam turbine, diesel engine or other power machinery. It converts the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and transmits it to the generator, which then converts it into electrical energy and outputs it to electrical equipment for use.

[0022] Battery: A device that converts chemical energy directly into electrical energy. It is a rechargeable battery designed to be recharged through a reversible chemical reaction. It usually refers to a lead-acid battery.

[0023] Controlled rectifier: refers to thyristor rectification, which uses the characteristics of thyristors to better control the strength of current.

[0024] Filter capacitor: Filter capacitor refers to an energy storage device installed at both ends of the rectifier circuit to reduce the AC ripple coefficient and improve efficient and smooth DC output.

[0025] Consistent: refers to the voltage difference between the generator set and the battery terminal being within a preset range, such as 0.3V.

[0026] The large voltage difference between the generator set and the battery terminal refers to the voltage difference between the generator set and the battery terminal exceeding a preset certain range, such as 0.3V.

[0027] 2. The embodiment is basically as shown in the attached Figure 1The figure shows a charging system for preventing sparks from a charging plug, comprising a generator set and a battery. The generator set output is connected to the battery via a controllable rectifier unit and a filter capacitor. In this embodiment, the generator set uses a magnetic motor to generate power and output three-phase power. The three-phase output of the generator is connected to the controllable rectifier unit, which is connected to a filter capacitor.

[0028] The output control unit is connected to the generator set and the battery, respectively. When the voltages at the generator set and battery terminals converge, the output control unit controls the electrical connection between the generator set and the battery to be conductive. Specifically, the output control unit includes an on-off switch, a voltage detection circuit, a main control CPU, a feedback adjustment unit, and a pre-charge circuit. The voltage detection circuit is used to detect the voltages of the generator set and the battery. When the voltage detection circuit detects that the voltages at the generator set and the battery terminals converge, the main control CPU controls the on-off switch to be conductive, thereby connecting the electrical connection between the generator set and the battery. When the voltage detection circuit detects a significant voltage difference between the generator set and the battery terminals, the feedback adjustment unit adjusts the voltage at the generator set or battery terminal until the voltages at the generator set and battery terminals converge. When the voltage at the generator set terminal is lower than the voltage at the battery terminal, the main control CPU controls the pre-charge circuit to charge the filter capacitor. The on-off switch is controlled by a MOS tube or a relay.

[0029] When the voltage detection circuit detects that the battery is low on power, the output control unit controls the generator set to start. Specifically, when the voltage detection circuit detects that the battery is low on power, the output control unit sends a start instruction to the pre-charging circuit. Upon receiving the start instruction, the pre-charging circuit supplies power to the generator set to start the generator set. When the voltage detection circuit detects that the battery is sufficiently charged or the main control CPU detects that mains power is supplied, the output control unit controls the generator set to shut down.

[0030] Based on the above-mentioned charging system, a charging method is also disclosed in this embodiment. When in use, the generator set of the charging system can be used as a backup emergency charging device for scenarios with energy storage batteries, such as new energy vehicle energy storage batteries or base station energy storage batteries. When in use, the voltage detection circuit is first used to detect the voltage at the generator set end and the battery end. When there is a large voltage difference between the generator set end and the battery end, the pre-charge current is turned on or the generator set output is adjusted to make the voltage at the generator set end and the battery end tend to be consistent. Then, the on-off switch is turned on to connect the charging line, thereby avoiding sparks and damage to components or plugs when connecting the plug.

[0031] Specifically, the voltage detection circuit detects the voltage of the generator set and the battery. When the voltage detection circuit detects that the voltages at the generator set and the battery end are approaching consistency, the main control CPU controls the on-off switch to conduct, and the electrical connection between the generator set and the battery is established. When the voltage detection circuit detects that the voltage difference between the generator set and the battery end is large, the feedback regulation unit adjusts the voltage of the generator set or the battery end until the voltages at the generator set and the battery end are approaching consistency. When the voltage at the generator set end is less than the voltage at the battery end, the main control CPU controls the pre-charge circuit to charge the filter capacitor. In this embodiment, approaching consistency means that the voltage difference between the generator set and the battery end is within 0.3V, that is, |V 发电机组 -V 蓄电池端 |=0.3 V. In other embodiments, the specific voltage difference value can be preset according to actual conditions.

[0032] The charging system in this embodiment can also realize the functions of automatic starting after the battery is low on power, and automatic shutting down when the battery is charged to a certain stage or when the mains power is supplied. Specifically, when the voltage detection circuit detects that the battery is low on power, the output control unit sends a start instruction to the pre-charging circuit, and the pre-charging circuit supplies power to the generator set to start the generator set upon receiving the start instruction; when the voltage detection circuit detects that the battery is sufficiently charged or the main control CPU detects that the mains power is supplied, the output control unit controls the generator set to shut down.

[0033] The battery charging reaches a certain stage when the battery voltage reaches a preset voltage value and the charging current is less than a preset current value. For example, if the preset voltage value is set to 59V and the preset current value is set to 5A, the device will automatically shut down when the battery voltage reaches 59V and the charging current is less than 5A. The preset voltage and current values ​​are set according to the battery model.

[0034] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A charging system for preventing sparks from a charging plug, comprising a generator set and a battery, wherein the output end of the generator set is connected to the battery via a controllable rectifier unit and a filter capacitor; characterized in that: It also includes an output control unit, which is connected to the generator set and the battery respectively. When the voltages of the generator set and the battery end tend to be consistent, the output control unit controls the electrical connection between the generator set and the battery to be turned on.

2. The charging system for preventing a charging plug from sparking according to claim 1, characterized in that: The output control unit includes an on-off switch for conducting or disconnecting the electrical connection between the generator set and the battery. The on-off switch is kept in an off state by default, and the electrical connection between the generator set and the battery is disconnected. A voltage detection circuit, used for detecting the voltage of the generator set and the battery; The main control CPU controls the on-off switch to be turned on when the voltage detection circuit detects that the voltages of the generator set and the battery end are tending to be consistent, and the electrical connection between the generator set and the battery is turned on.

3. The charging system for preventing a charging plug from sparking according to claim 2, characterized in that: When the voltage detection circuit detects a large voltage difference between the generator set and the battery terminal, the output control unit adjusts the voltage of the generator set or the battery terminal until the voltages of the generator set and the battery terminal are consistent.

4. The charging system for preventing a charging plug from igniting according to claim 3, characterized in that: The output control unit includes a feedback regulation unit that is communicatively connected to the generator set. When the generator set terminal voltage is inconsistent with the battery terminal voltage, the feedback regulation unit regulates the output voltage of the generator set to be equivalent to the battery terminal voltage.

5. The charging system for preventing a charging plug from igniting according to claim 3 or 4, characterized in that: The output control unit further includes a pre-charging circuit. When the terminal voltage of the generator set is lower than the terminal voltage of the battery, the main control CPU controls the pre-charging circuit to charge the filter capacitor.

6. The charging system for preventing a charging plug from sparking according to claim 5, characterized in that: When the voltage detection circuit detects that the battery is low on power, the output control unit controls the generator set to start; when the voltage detection circuit detects that the battery is sufficiently charged, the output control unit controls the generator set to stop.

7. The charging system for preventing a charging plug from sparking according to claim 6, characterized in that: When the voltage detection circuit detects that the battery is low on power, the output control unit sends a start instruction to the pre-charging circuit. Upon receiving the start instruction, the pre-charging circuit supplies power to the generator set to start the generator set.

8. The charging system for preventing a charging plug from igniting according to claim 6 or 7, characterized in that: When the main control CPU detects that mains power is supplied, the generator set is controlled to shut down.

9. A charging method for preventing a charging plug from sparking, characterized in that: A charging system for preventing a charging plug from igniting as described in any one of claims 1 to 8 is used.

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