Current self-distribution charger and control method thereof

Abstract

The application relates to a current self-distribution charger and a control method thereof, and relates to the technical field of chargers.The charger comprises a power supply module, a main control module and a charging distribution module; a power supply module input end is connected with a power supply; power supply module output ends are respectively connected with the main control module and the charging distribution module, and are used for supplying power to the main control module and the charging distribution module; the charging distribution module comprises a plurality of charging distribution units; charging distribution unit output ends are connected with to-be-charged equipment; the main control module is connected with the plurality of charging distribution units; the main control module is used for receiving detection currents sent by the plurality of charging distribution units, judging the charging states of each to-be-charged equipment according to the detection currents, generating charging current adjustment signals of each charging distribution unit according to the charging states of all the to-be-charged equipment, and sending the charging current adjustment signals to corresponding charging distribution units. The application has the effects of improving the convenience and flexibility when charging a plurality of to-be-charged equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chargers, in particular to a current self-distribution charger and a control method thereof. BACKGROUND

[0002] When charging a lithium battery, the lithium battery is usually connected to a charger, and the charger is provided with a fixed charging current. When the voltage of the lithium battery is lower than the set voltage value, the charger charges the lithium battery with the fixed charging current until the voltage of the lithium battery reaches the set voltage value, and then stops charging.

[0003] When charging multiple lithium batteries at the same time, the charger is usually provided with multiple charging interfaces, and the fixed charging current is output through the multiple charging interfaces to charge the multiple lithium batteries. However, in actual use, the remaining power of different lithium batteries may be different, and the charging time required may also be different, so it is necessary to adjust the charging current of different lithium batteries. However, the existing charger cannot automatically distribute the charging current of multiple lithium batteries, which may cause inconvenience in use. SUMMARY

[0004] The purpose of the present application is to provide a current self-distribution charger and a control method thereof, to improve the convenience and flexibility when charging multiple devices to be charged.

[0005] In a first aspect, the current self-distribution charger provided by the present application adopts the following technical solution:

[0006] A current self-distribution charger includes a power supply module, a main control module, and a charging distribution module.

[0007] The power supply module input end is connected to a power supply, and the power supply module output end is connected to the main control module and the charging distribution module, respectively, for supplying power to the main control module and the charging distribution module.

[0008] The charging distribution module includes a plurality of charging distribution units, and the charging distribution unit output end is connected to a device to be charged.

[0009] The main control module is connected to the plurality of charging distribution units, and the main control module is used to receive the detection current sent by the plurality of charging distribution units, judge the charging state of each device to be charged according to the detection current, generate a charging current adjustment signal for each charging distribution unit according to the charging state of all devices to be charged, and send the charging current adjustment signal to the corresponding charging distribution unit.

[0010] By adopting the technical scheme, the application controls the automatic distribution of the charging current of the plurality of charging distribution units to the plurality of to-be-charged devices by the master control module, so that the charger can adjust the charging current of different to-be-charged devices according to the actual situation or use demand when charging the plurality of to-be-charged devices. The master control module receives the detection current sent by the plurality of charging distribution units, judges the charging state of each to-be-charged device according to the detection current, generates the charging current adjustment signal of each charging distribution unit according to the charging state of all to-be-charged devices, and sends the charging current adjustment signal to the corresponding charging distribution unit. Since the detection current is small, it means that the to-be-charged device is about to be fully charged, so the application can automatically reduce the charging current of the to-be-charged device with smaller detection current and increase the charging current to the to-be-charged device with larger detection current, so that the to-be-charged device that is not fully charged can obtain more charging current and charge more quickly. The charging current of each to-be-charged device is reasonably distributed according to the charging state of each to-be-charged device, thereby improving the convenience and flexibility when charging the plurality of to-be-charged devices.

[0011] Further, the charging distribution unit comprises a charging control circuit and a charging output circuit;

[0012] The input end of the charging control circuit is connected to the output end of the master control module, the output end of the charging control circuit is connected to the input end of the charging output circuit, and the output end of the charging output circuit is connected to the to-be-charged device.

[0013] The charging control circuit is used for receiving the charging current adjustment signal sent by the master control module and adjusting the charging current output to the to-be-charged device according to the charging current adjustment signal, and the charging output circuit is used for outputting the charging current to the to-be-charged device.

[0014] By adopting the above technical scheme, the charging current adjustment signal sent by the master control module is usually a pulse width modulation signal, and the average level of the output signal is controlled by changing the pulse width of the signal, so that the application receives the pulse width modulation signal by the charging control circuit and adjusts the charging current according to the pulse width of the signal. The adjusted charging current is output to the charging output circuit, and then output to the to-be-charged device by the charging output circuit, so as to realize the automatic distribution and adjustment of the charging current and ensure the accuracy of the automatic distribution of the charging current.

[0015] Further, the charging distribution unit further comprises a charging detection circuit;

[0016] The input end of the charging detection circuit is connected to the output end of the charging output circuit, and the output end of the charging detection circuit is connected to the detection current input end of the master control module.

[0017] The charging detection circuit is used for generating the detection current and outputting the detection current to the master control module.

[0018] By adopting the technical scheme, the charging detection circuit is used for current detection on the charging output circuit, and generates a detection current output to the master control module so that the master control module obtains the charging state of the device to be charged through the detection current, and ensures the reliability of subsequent distribution of the charging current according to the charging state of the device to be charged.

[0019] Further, the charging output circuit comprises a current-limiting resistor, the current-limiting resistor is connected in series with the device to be charged, and the output end of the current-limiting resistor is connected to the detection current input end of the master control module through the charging detection circuit.

[0020] By adopting the technical scheme, since the current-limiting resistor is connected in series at the output end of the circuit, the device to be charged can be protected. Moreover, since the current flowing through the current-limiting resistor is the same as that of the device to be charged, the current detection on the current-limiting resistor is equivalent to the current detection on the device to be charged, and the accuracy of current detection is ensured.

[0021] Further, the charging detection circuit comprises a differential amplifier, the output end of the current-limiting resistor is connected to the input end of the differential amplifier, and the output end of the differential amplifier is connected to the detection current input end of the master control module.

[0022] By adopting the technical scheme, since the current flowing to the device to be charged is small after the current-limiting resistor is connected to the circuit, the current flowing out of the current-limiting resistor is amplified by the differential amplifier, so that the master control module can more accurately detect the change of the obtained detection current, thereby increasing the accuracy of current detection.

[0023] Further, the master control module comprises a master control chip, the master control chip comprises a plurality of detection current input pins and a plurality of charging current adjustment signal output pins matched with the charging distribution unit.

[0024] The detection current input pins are connected to the output end of the charging detection circuit, and the charging current adjustment signal output pins are connected to the input end of the charging control circuit.

[0025] By adopting the technical scheme, the master control module receives the detection current output by the charging detection circuit of the plurality of charging distribution units through the plurality of current input pins of the master control chip, identifies the charging state of the device to be charged according to the detection current through the internal program of the master control chip, generates charging current adjustment signals according to the charging states of the plurality of devices to be charged, and outputs the charging current adjustment signals to the charging control circuit through the charging current adjustment signal output pins, thereby automatically distributing the charging current of the device to be charged, and improving the convenience and flexibility when charging the plurality of devices to be charged.

[0026] Further, the master control chip further comprises a plurality of LED driving signal output pins matched with the charging distribution unit, and the charging distribution unit further comprises an LED circuit.

[0027] The LED driving signal output pins are connected to an input end of the LED circuit.

[0028] By adopting the above technical solution, the LED circuit is controlled by the LED driving signal output pins of the master control chip, so that the current charging state of the device to be charged can be displayed by the LED circuit, and thus the staff can quickly know the current charging state, and the convenience of using the charger is improved.

[0029] Further, the LED circuit comprises at least two LED lamp beads of different colors in parallel.

[0030] By adopting the above technical solution, different charging states can be displayed by the LED lamp beads of different colors, so that the staff can quickly know the current charging state, and the convenience of using the charger is improved.

[0031] Further, the master control module comprises a voltage switching switch, which is used to switch a preset voltage value for the master control module to judge the full charge state of the device to be charged.

[0032] By adopting the above technical solution, in order to avoid overcharging of the device to be charged and shorten the service life, the device to be charged can be protected by not being fully charged to full charge during charging. Therefore, the voltage switching switch is arranged, the voltage switching switch is connected with the master control chip, when the voltage switching switch is turned on, an output voltage switching signal is output to the master control chip, two different preset voltage values for the master control chip to judge the full charge state of the device to be charged are preset, and the preset voltage values for the master control chip to judge the full charge state of the device to be charged are switched by receiving the voltage switching signal, so as to achieve the effect of protecting the device to be charged.

[0033] In the second aspect, the control method of the current self-distribution charger adopts the following technical solution:

[0034] The control method of the current self-distribution charger is applied to the current self-distribution charger in the first aspect, and comprises the following steps:

[0035] The master control module receives detection currents sent by a plurality of charging distribution units.

[0036] The master control module judges charging states of all devices to be charged according to the detection currents and a preset current threshold, and the charging states include not full, about to be full and full.

[0037] The master module generates a charging current adjustment signal for each charging distribution unit according to the charging states of all the devices to be charged, which includes but is not limited to a charging current increasing signal, a charging current decreasing signal and a charging stopping signal;

[0038] The master module sends the charging current adjustment signal to the corresponding charging distribution unit.

[0039] By adopting the above technical solution, the application compares the preset current threshold with the detection current actually received from the charging distribution unit to determine the charging state of the device to be charged as not full, about to be full and full, generates a charging current adjustment signal for each charging distribution unit according to the charging states of all the devices to be charged, wherein the charging current adjustment signal sent to the charging distribution unit corresponding to the device to be charged not full is a charging current increasing signal, the charging current adjustment signal sent to the charging distribution unit corresponding to the device to be charged about to be full is a charging current decreasing signal, and the charging current adjustment signal sent to the charging distribution unit corresponding to the device to be charged full is a charging stopping signal. Thus, the self-distribution of the charging current is ensured to be reasonable, and the convenience and flexibility of charging multiple devices to be charged are improved.

[0040] In summary, the application has at least one of the following beneficial technical effects:

[0041] 1. The application can automatically reduce the charging current of the device to be charged with smaller detection current and increase the charging current to the device to be charged with larger detection current, so that the device to be charged not full can obtain more charging current and charge more quickly, and the charging current of each device to be charged is reasonably distributed according to the charging state of each device to be charged, thereby improving the convenience and flexibility of charging multiple devices to be charged;

[0042] 2. The application receives a pulse width modulation signal through a charging control circuit and adjusts the charging current according to the pulse width of the signal, and outputs the adjusted charging current to a charging output circuit, and then outputs the charging current to the device to be charged through the charging output circuit, so as to realize automatic distribution and adjustment of the charging current and ensure the accuracy of the self-distribution of the charging current;

[0043] 3. The charging detection circuit of the application is used for current detection of the charging output circuit, and generates a detection current output to the master module so that the master module can obtain the charging state of the device to be charged through the detection current, thereby ensuring the reliability of subsequent distribution of the charging current according to the charging state of the device to be charged;

[0044] 4. The application amplifies the current flowing out of the current limiting resistor through a differential amplifier, so that the master module can more accurately detect the change of the obtained detection current, thereby increasing the accuracy of current detection. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is the overall module structure diagram of the current self-distribution charger of the embodiment of the present application;

[0046] Figure 2 is the overall circuit principle diagram of the current self-distribution charger of the embodiment of the present application;

[0047] Figure 3 is the circuit principle diagram of the main control module of the embodiment of the present application;

[0048] Figure 4 is the circuit principle diagram of the fourth charging distribution unit of the embodiment of the present application;

[0049] Figure 5 is the control method flow chart of the current self-distribution charger of the embodiment of the present application;

[0050] In the figure, 1, power supply module; 2, main control module; 3, charging distribution module; 31, first charging distribution unit; 32, second charging distribution unit; 33, third charging distribution unit; 34, fourth charging distribution unit; 341, fourth charging control circuit; 342, fourth charging output circuit; 343, fourth charging detection circuit; 344, fourth LED circuit. DETAILED DESCRIPTION

[0051] The following will be described in detail in combination with the accompanying drawings. Figure 1 - the accompanying drawings Figure 5 The present application will be further described in detail.

[0052] When charging multiple lithium batteries at the same time, usually multiple charging interfaces are set for the charging device, and fixed charging current is output through the multiple charging interfaces to charge the multiple lithium batteries. However, in actual use, the remaining power of different lithium batteries may be different, and the required charging time is also different, and there may be a need to adjust the charging current of different lithium batteries, and the existing charger cannot automatically distribute the charging current of multiple lithium batteries, which is easy to cause certain inconvenience in use, and therefore the present embodiment provides a current self-distribution charger, which refers to Figure 1, including a power supply module 1, a main control module 2 and a charging distribution module 3. The input end of the power supply module 1 is connected to a power supply, and the output end of the power supply module 1 is connected to the main control module 2 and the charging distribution module 3 respectively, for supplying power to the main control module 2 and the charging distribution module 3. Assuming that the charger of the embodiment can charge four lithium batteries at the same time, the charging distribution module 3 includes a first charging distribution unit 31, a second charging distribution unit 32, a third charging distribution unit 33 and a fourth charging distribution unit 34, and the output ends of the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34 are connected to the devices to be charged, i.e. the lithium batteries to be charged. The main control module 2 is connected to the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34, and the main control module 2 is used for receiving the detection currents sent by the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34, judging the charging states of each lithium battery to be charged according to the detection currents, generating charging current adjustment signals of the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34 according to the charging states of all lithium batteries to be charged, and sending the charging current adjustment signals to the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34 respectively.

[0053] The implementation principle of the embodiment of the application is that the main control module 2 controls the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34 to automatically distribute the charging currents of the four lithium batteries to be charged, so that the charger can adjust the charging current sizes of different devices to be charged according to the actual situation or use requirements when charging multiple lithium batteries to be charged. The main control module 2 receives the detection currents sent by the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34, judges the charging states of each lithium battery to be charged according to the detection currents, generates charging current adjustment signals of the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34 according to the charging states of all lithium batteries to be charged, and sends the charging current adjustment signals to the corresponding charging distribution units, reasonably distributes the charging currents of each lithium battery to be charged according to the charging states of each lithium battery to be charged, and improves the convenience and flexibility when charging multiple lithium batteries to be charged.

[0054] In the implementation process, the four lithium batteries to be charged are connected to the DC-1 interface of the first charging distribution unit 31, the DC-2 interface of the second charging distribution unit 32, the DC-3 interface of the third charging distribution unit 33, and the DC-5 interface of the fourth charging distribution unit 34, respectively. Since the detection current of the lithium battery will automatically decrease when the lithium battery is about to be fully charged, when the detection current output by the charging distribution unit decreases, it indicates that the lithium battery connected to the charging distribution unit is about to be fully charged. After the main control module 2 receives the detection current of the lithium battery to be charged, it is determined that the lithium battery to be charged is about to be fully charged, and a charging current adjustment signal for reducing the charging current is generated to the charging distribution unit, so as to automatically reduce the charging current of the lithium battery to be charged, and synchronously increase the reduced charging current to the lithium battery to be charged with a larger detection current, so that the lithium battery to be charged which is not fully charged can obtain a larger charging current and can be charged more quickly, and all lithium batteries to be charged can be quickly fully charged.

[0055] In another embodiment, in addition to automatically distributing the charging current according to the charging state of the lithium battery, the charging current can also be distributed according to the use demand. For example, when the lithium battery is urgently needed but all lithium batteries are not fully charged, the charging current of one of the charging distribution units is increased, and the charging currents of the other charging distribution units are correspondingly reduced, so that the lithium battery corresponding to the charging distribution unit can be quickly fully charged for use.

[0056] As shown in Figure 2 , the power supply module 1 filters and rectifies the input power supply of the mains and performs voltage reduction and other processes, and outputs a 21.5V, 10A power supply from the VO+ output end to supply power to the main control module 2 and the charging distribution module 3. In the implementation process, the IC1 of the power supply module 1 adopts the current resonance control LLC chip MCZ5211ST.

[0057] As shown in Figure 2 and Figure 3As shown, the master control module 2 includes a master control chip U1 and its peripheral circuit, the master control chip U1 adopts a single-chip microcomputer with a model number of SC92F7463B, the master control chip U1 includes 28 pins, including 8 current detection input pins, which are AIN1-AIN8 pins, the AIN3 pin and the AIN4 pin are connected to the current detection output ends VIN3 end and VIN4 end of the first charging distribution unit 31 respectively, the AIN5 pin and the AIN6 pin are connected to the current detection output ends VIN5 end and VIN6 end of the second charging distribution unit 32 respectively, the AIN7 pin and the AIN8 pin are connected to the current detection output ends VIN7 end and VIN8 end of the third charging distribution unit 33 respectively, and the AIN1 pin and the AIN2 pin are connected to the current detection output ends VIN1 end and VIN2 end of the fourth charging distribution unit 34 respectively. The master control chip U1 receives the detection currents output by each charging distribution unit through the current detection input pins, judges the charging state of each lithium battery to be charged according to the detection currents, and then generates a charging current adjustment signal according to the charging states of all lithium batteries to be charged.

[0058] As shown in Figure 2 and Figure 3 The master control chip U1 also includes 4 charging current adjustment signal output pins for outputting charging current adjustment signals to the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34 respectively, and the 4 charging current adjustment signal output pins are PWM0-PWM3 pins, wherein the PWM0 pin is connected to the PWM0 end of the first charging distribution unit 31, the PWM1 pin is connected to the PWM1 end of the second charging distribution unit 32, the PWM2 pin is connected to the PWM2 end of the third charging distribution unit 33, and the PWM3 pin is connected to the PWM3 end of the fourth charging distribution unit 34. PWM is pulse width modulation, which modulates the bias of the transistor base or MOS tube gate according to the change of the corresponding load, so as to realize the change of the transistor or MOS tube conduction time, thereby realizing the change of the output of the switching power supply. The charging current adjustment signal of the present application is a PWM signal, which is sent to the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34 through the PWM0-PWM3 pins respectively, so as to realize the adjustment of the charging current.

[0059] As shown in Figure 2 and Figure 3As shown, the main control chip U1 further includes 8 LED driving signal output pins, namely LED0A pin, LED0B pin, LED1A pin, LED1B pin, LED2A pin, LED2B pin, LED3A pin and LED3B pin, which are used to send LED driving signals to each charging distribution unit, wherein the LED2A pin and the LED1B pin are connected to the first charging distribution unit 31, the LED1A pin and the LED0B pin are connected to the second charging distribution unit 32, the LED0A pin and the LED3B pin are connected to the third charging distribution unit 33, and the LED3A pin and the LED2B pin are connected to the fourth charging distribution unit 34.

[0060] When charging the lithium battery, overcharging may cause the service life of the lithium battery to be shortened, so in actual use, the lithium battery can be protected by not being fully charged to full power. As shown in Figure 2 As shown, the main control module 2 further includes a voltage switching switch S1, and the output end TCK-K end of the voltage switching switch S1 is connected to the voltage switching pin TCK-K pin of the main control chip U1. When the voltage switching switch S1 is turned on, the output end outputs a voltage switching signal to the main control chip U1. In the specific implementation process, two different preset voltage values for judging the full power state of the device to be charged are 100% and 60%. When the voltage switching switch S1 is turned on, the lithium battery is charged to 60%, which is judged to be full. When the voltage switching switch S1 is turned off, the lithium battery is charged to 100%, which is judged to be full. Therefore, when it is necessary to charge the lithium battery to be charged, the voltage switching switch S1 can be turned on.

[0061] As shown in Figure 3 As shown, the main control chip further includes a three-color lamp bead LED1, and the No. 2 pin, No. 4 pin and No. 5 pin of the main control chip U1 are connected to the three-color lamp bead LED1, which is used to control the light-emitting state of the three-color lamp bead LED1. In the specific implementation process, the overall state of the charger can be reflected by controlling the color and light-emitting state of the three-color lamp bead LED1. For example, when the main control chip U1 abnormally occurs or detects that the current charging state is abnormal, the three-color lamp bead LED1 is controlled to emit red light and flicker, so as to remind the staff to check the charger in time.

[0062] The embodiment can also be provided with a plurality of charging distribution units, each of which has the same structure. By increasing the pins of the main control chip U1 to connect a plurality of charging distribution units, simultaneous charging of a plurality of lithium batteries and self-distribution of charging current can be realized. Taking the fourth charging distribution unit 34 as an example, as shown in Figure 4 As shown, the fourth charging distribution unit 34 includes a fourth charging control circuit 341, a fourth charging output circuit 342, a fourth charging detection circuit 343 and a fourth LED circuit 344.

[0063] As Figure 2 and Figure 4 shown, the fourth charging current regulation signal input end PWM3 of the fourth charging control circuit 341 is connected to the charging current regulation signal output pin PWM3 of the master control chip U1, the power supply input end VO+ is connected to the output end of the power supply module 1, and the output end of the fourth charging control circuit 341 is connected to the fourth charging output circuit 342, which is used to receive the charging current regulation signal sent by the master control chip U1 and adjust the power supply input by the power supply module 1 according to the charging current regulation signal to adjust the charging current output to the fourth charging output circuit 342. The charging current regulation signal input end PWM3 is connected to the parallel capacitor C31 and resistor R75, the capacitor C31 and resistor R75 play a filtering role, and then the gate of the NMOS tube Q17 is connected, the source of the NMOS tube Q17 is grounded, and the drain of the NMOS tube Q17 is connected to the resistor R69 and the parallel triode Q13 and Q15, wherein Q13 is an NPN type triode with a specific model of S3904, and Q15 is a PNP type triode with a specific model of S3906, the emitter of the triode Q13 and the collector of the triode Q15 are commonly connected to one end of the resistor R71, the other end of the resistor R71 is connected to the gate of the PMOS tube P-MOS4 and the resistor R81 respectively, the resistor R81 is grounded, and the source of the P-MOS4 is connected to the fourth charging output circuit 342. In the specific implementation process, the P-MOS4 is a switch tube, and Q13, Q15 and Q17 cooperate to drive the switch of the P-MOS4 through the PWM signal of the charging current regulation signal, so as to control whether to charge the lithium battery connected to the fourth power supply distribution unit.

[0064] As Figure 2 and Figure 4 shown, the output end of the fourth charging output circuit 342 is a charging interface DC-4, which is used to connect the lithium battery to be charged for charging. The input end of the fourth charging output circuit 342 is connected to the inductor L4, and the specific model of the inductor L4 is 35UH5A, which is used to further filter the current output by the fourth charging control circuit 341. The fourth charging output circuit 342 further includes a current limiting resistor R90, which is used to limit the size of the current in the branch to prevent the burning of the series-connected components due to excessive current. The current limiting resistor R90 in the embodiment mainly plays a role in protecting the lithium battery being charged.

[0065] As Figure 2 and Figure 4As shown, the current-limiting resistor R90 is connected to the fourth charging detection circuit 343 through the A4 port, the fourth charging detection circuit 343 is connected to the detection current input pin AIN2 of the master control chip U1 through the VIN2 port, and is used to generate the detection current of the current-limiting resistor R90 and output to the master control chip U1. The fourth charging detection circuit 343 is mainly composed of a differential amplifier U8 and its peripheral circuit, and the differential amplifier U8 is used to amplify the current flowing out of the current-limiting resistor R90, so that the change of the detection current finally output to the master control chip U1 is more obvious, and the detection of the master control chip U1 is facilitated. In the specific implementation process, the model of the differential amplifier U8 is LM321.

[0066] As shown in Figure 2 and Figure 4 As shown, the fourth LED circuit 344 includes a double-color lamp bead LED5, and the input end of the LED5 is connected to the LED3A pin and the LED2B pin, and is used to receive the LED driving signal generated by the master control chip U1. In the specific implementation process, the fourth LED circuit 344 can display the current charging state of the fourth charging distribution unit 34 through different colors and different light emitting modes. For example, the lithium battery connected to DC-4 is fully charged, and the green light of the fourth LED circuit 344 is long, and the lithium battery connected to DC-4 is being charged, and the red light of the fourth LED circuit 344 is flashing. So that the staff can quickly know the current charging state of each charging distribution unit.

[0067] As shown in Figure 5 The application also provides a control method of the current self-distribution charger, which is applied to the current self-distribution charger and includes the following steps.

[0068] S1, the master control module 2 receives the detection currents sent by the charging distribution units.

[0069] Specifically, the master control chip U1 of the master control module 2 receives the first detection current, the second detection current, the third detection current and the fourth detection current sent by the first charging distribution unit 31, the second charging distribution unit 32, the third charging distribution unit 33 and the fourth charging distribution unit 34 respectively.

[0070] S2, the master control module 2 judges the charging states of all the devices to be charged according to the detection currents and the preset current threshold.

[0071] Specifically, the charging state includes not full, about to be full and full, the master control chip U1 of the master control module 2 pre-stores a preset current threshold, the current threshold is a standard for judging whether the device to be charged is about to be full, when the detection current is greater than the current threshold, it indicates that the charging state of the device to be charged is not full, when the detection current is less than the current threshold, it indicates that the charging state of the device to be charged is about to be full, and when the detection current becomes 0, it indicates that the charging state of the device to be charged is full.

[0072] S3, the master module 2 generates a charging current adjustment signal for each charging distribution unit according to the charging state of all the devices to be charged.

[0073] Specifically, the charging current adjustment signal includes but is not limited to a charging current increase signal, a charging current decrease signal, and a charging stop signal. When the charging state of a device to be charged is about to be full and the charging state of other devices to be charged is not full, a charging current decrease signal is generated for the device to be charged about to be full, and a charging current increase signal is generated for the device to be charged not full. When the charging state of a device to be charged is full, a charging stop signal is generated for the device to be charged.

[0074] S4, the master module 2 sends the charging current adjustment signal to the corresponding charging distribution unit.

[0075] Specifically, the master chip U1 sends the corresponding charging current adjustment signal to each charging distribution unit through the charging current adjustment signal output pin, so that the charging distribution unit adjusts the charging current output to the device to be charged according to the charging current adjustment signal, thereby realizing current self-distribution when multiple devices to be charged are charged at the same time.

[0076] The implementation principle of the embodiment of the present application is: by comparing the preset current threshold with the actual received detection current sent by the charging distribution unit, the charging state of the device to be charged is determined to be not full, about to be full, and full, and a charging current adjustment signal for each charging distribution unit is generated according to the charging state of all the devices to be charged, wherein the charging current adjustment signal sent to the charging distribution unit corresponding to the device to be charged not full is a charging current increase signal, the charging current adjustment signal sent to the charging distribution unit corresponding to the device to be charged about to be full is a charging current decrease signal, and the charging current adjustment signal sent to the charging distribution unit corresponding to the device to be charged full is a charging stop signal. Thus, the self-distribution of the charging current is ensured to be reasonable, and the convenience and flexibility of charging multiple devices to be charged are improved.

[0077] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are denoted by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A current self-distributing charger, characterized in that: It comprises a power supply module (1), a main control module (2) and a charging distribution module (3); The input end of the power supply module (1) is connected to a power source, and the output end of the power supply module (1) is respectively connected to the main control module (2) and the charging distribution module (3), for supplying power to the main control module (2) and the charging distribution module (3); The charging distribution module (3) comprises a plurality of charging distribution units, wherein the output end of the charging distribution unit is connected to the device to be charged; The main control module (2) is interconnected with a plurality of charging distribution units, and is used to receive detection currents sent by the plurality of charging distribution units, and to determine the charging state of each device to be charged according to the detection current, and to generate a charging current adjustment signal for each charging distribution unit according to the charging state of all devices to be charged, and to send the charging current adjustment signal to the corresponding charging distribution unit; The charging distribution unit includes a charging control circuit, a charging output circuit and a charging detection circuit; The charging control circuit input end is connected to the charging current regulation signal output end of the main control module (2), the charging control circuit output end is connected to the charging output circuit input end, and the charging output circuit output end is connected to the device to be charged; The charging control circuit is used to receive a charging current adjustment signal sent by the main control module (2) and adjust the charging current output to the device to be charged according to the charging current adjustment signal, and the charging output circuit is used to output the charging current to the device to be charged; The input end of the charging detection circuit is connected to the output end of the charging output circuit, and the output end of the charging detection circuit is connected to the detection current input end of the main control module (2); The charging detection circuit is used to generate a detection current and output the detection current to a main control module (2); The charging current adjustment signal input end of the charging control circuit is connected to a capacitor C31 and a resistor R75 connected in parallel. The capacitor C31 and the resistor R75 act as filters. The input end is then connected to the gate of the NMOS transistor Q17. The source of the NMOS transistor Q17 is grounded. The drain of the NMOS transistor Q17 is connected to a resistor R69 and parallel transistors Q13 and Q15. The emitter of the transistor Q13 and the collector of the transistor Q15 are commonly connected to one end of the resistor R71. The other end of the resistor R71 is respectively connected to the gate of the PMOS transistor PMOS4 and a resistor R81. The resistor R81 is grounded. The source of the PMOS4 is connected to the charging output circuit. The PMOS4 is a switching transistor. The transistors Q13, Q15, and the NMOS transistor Q17 cooperate with the PWM signal of the charging current adjustment signal to drive the switch of the PMOS4, thereby controlling whether to charge the lithium battery to be charged connected to the power distribution unit.

2. A current self-distributing charger according to claim 1, characterized in that: The charging output circuit comprises a current limiting resistor, which is connected in series with the device to be charged, and the output end of the current limiting resistor is connected to the detection current input end of the main control module (2) through the charging detection circuit.

3. A current self-distributing charger according to claim 2, characterized in that: The charging detection circuit comprises a differential amplifier, the output end of the current limiting resistor is connected to the input end of the differential amplifier, and the output end of the differential amplifier is connected to the detection current input end of the main control module (2).

4. A current self-distributing charger according to claim 1, characterized in that: The main control module (2) comprises a main control chip, and the main control chip comprises a plurality of detection current input pins and a plurality of charging current adjustment signal output pins that match the charging distribution unit; The detection current input pin is connected to the output end of the charging detection circuit, and the charging current adjustment signal output pin is connected to the input end of the charging control circuit.

5. A current self-distributing charger according to claim 4, characterized in that: The main control chip also includes a plurality of LED drive signal output pins matching the charging distribution unit, and the charging distribution unit also includes an LED circuit; The LED driving signal output pin is connected to the LED circuit input end.

6. A current self-distributing charger according to claim 5, characterized in that: The LED circuit includes at least two LED lamp beads of different colors connected in parallel.

7. A current self-distributing charger according to any one of claims 1 to 6, characterized in that: The main control module (2) comprises a voltage switching switch, and the voltage switching switch is used to switch the preset voltage value for the main control module (2) to judge whether the device to be charged is in a fully charged state.

8. A control method for a current self-distributing charger, applied to a current self-distributing charger according to any one of claims 1 to 7, characterized in that: include: The main control module (2) receives detection currents sent by a plurality of charging distribution units; The main control module (2) determines the charging status of all devices to be charged based on the detected current and a preset current threshold, wherein the charging status includes not fully charged, about to be fully charged, and fully charged; The main control module (2) generates a charging current adjustment signal for each charging distribution unit according to the charging status of all devices to be charged, wherein the charging current adjustment signal includes a charging current increase signal, a charging current decrease signal and a charging stop signal; The main control module (2) sends the charging current adjustment signal to the corresponding charging distribution unit.

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