Charging communication circuit

Abstract

The utility model relates to a charging communication circuit, which is applied to a charger and a battery pack, an MCU (Microprogrammed Control Unit) of the charger and an MCU of the battery pack are respectively connected with a charging communication circuit, and the charging communication circuit electrically connected with the MCU of the charger is connected with the charging communication circuit electrically connected with the MCU of the battery pack through a communication interface; the charging communication circuit comprises a first switch tube, a second switch tube and a third switch tube. According to the utility model, the charging communication circuit is connected with the MCU of the corresponding charger or the MCU of the battery pack, and the charging communication circuit electrically connected with the MCU of the charger is connected with the charging communication circuit electrically connected with the MCU of the battery pack through the communication interface, so that the charger and the battery pack share the communication interface, and the charging communication circuit is connected; according to the invention, correct sending and receiving of data are realized, data transmission safety is high, the charger monitors the state of the battery pack in real time, charging is adjusted according to the state of the battery pack, and charging safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging circuits, in particular to a charging communication circuit. Background Art

[0002] The existing charger for power tools charges with fixed charging parameters set according to the parameter specifications of the battery pack, and cannot monitor information such as the temperature of the battery pack, the voltage of each cell of the battery pack, and the allowable safe charging current in real time. The charger only provides electric energy and cannot communicate with the battery pack, which poses certain potential safety hazards. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a charging communication circuit to realize the communication between the charger and the battery pack and facilitate the real-time monitoring of the state of the battery pack.

[0004] To solve the above technical problem, the purpose of the utility model is realized through the following technical scheme: provide a charging communication circuit, which is applied to the charger and the battery pack. The MCU of the charger and the MCU of the battery pack are respectively connected to the charging communication circuit, and the charging communication circuit electrically connected to the MCU of the charger is connected to the charging communication circuit electrically connected to the MCU of the battery pack through a communication interface.

[0005] The beneficial technical effect of the utility model lies in that: the charging communication circuit of the utility model is connected to the corresponding MCU of the charger or the MCU of the battery pack, and the charging communication circuit electrically connected to the MCU of the charger is connected to the charging communication circuit electrically connected to the MCU of the battery pack through a communication interface, so that the charger and the battery pack share the communication interface and the charging communication circuits are connected to realize the correct sending and receiving of data, and the security of data transmission is high, enabling the charger and the battery pack to communicate with each other, thereby exchanging data, realizing the real-time monitoring of the state of the battery pack by the charger, adjusting the charging according to the state of the battery pack, and improving the charging safety. Description of the Drawings

[0006] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0007] Figure 1 It is the circuit schematic diagram of the charging communication circuit provided by the embodiment of the utility model;

[0008] Figure 2 It is the circuit schematic diagram of the communication interface provided by the embodiment of the utility model. Detailed implementation manners

[0009] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0010] Please refer to Figure 1 and Figure 2 , Figure 1 which is the circuit schematic diagram of the charging communication circuit provided by the embodiment of the present invention. The charging communication circuit is applied to a charger and a battery pack. The MCU of the charger and the MCU of the battery pack are respectively connected to a charging communication circuit. The charging communication circuit electrically connected to the MCU of the charger is connected to the charging communication circuit electrically connected to the MCU of the battery pack through the communication interface COM1.

[0011] Among them, the number of battery packs can be multiple. The charging communication circuits are in one-to-one correspondence with the battery packs and the chargers. Then, charging communication circuits are respectively provided in the charger and the battery pack. The charging communication circuit is connected to the corresponding MCU of the charger or the battery pack. And the charging communication circuit electrically connected to the MCU of the charger is connected to the charging communication circuit electrically connected to the MCU of the battery pack through the communication interface COM1, so that the charger and the battery pack share the communication interface COM1, and the charging communication circuits are connected to each other to realize the correct sending and receiving of data. The security of data transmission is high, enabling the charger and the battery pack to communicate with each other, thereby performing data exchange, realizing the charger to monitor the state of the battery pack in real time, and adjusting the charging according to the state of the battery pack to improve the charging safety. During the communication between the charger and the battery pack, a series of instructions can be sent from the battery pack to the charger. After receiving the instructions, the charger performs data CRC check. When the check is correct, the corresponding instructions are read to obtain the state information of the battery pack, so as to adjust the charging parameters according to the state of the battery pack. The state information of the battery pack includes the temperature value of the battery in the battery pack, the overall voltage value of the battery pack, the voltage value of a single cell in the battery pack, the allowable charging current value of the battery pack, the allowable charging voltage value of the battery pack, the type of battery in the battery pack, and / or the abnormal value of the battery in the battery pack, etc.

[0012] Specifically, in this embodiment, the communication interface COM1 is a COM port. Among them, the COM port (Communication Port) is a computer interface standard, mainly used for serial communication, adopting a serial communication protocol, and completing communication transmission through a small number of lines. The communication line of the COM port is simple, and only a pair of transmission lines are required to achieve two-way communication.

[0013] Specifically, in this embodiment, the charging communication circuit includes a first switching transistor Q1, a second switching transistor Q2, and a third switching transistor Q3. The control terminal of the first switching transistor Q1 is connected to the transmission pin TX0 of the corresponding MCU. The output terminal of the first switching transistor Q1 is connected to the control terminal of the second switching transistor Q2. A ninth resistor R9 with one end connected to the supply voltage is electrically connected between the output terminal of the first switching transistor Q1 and the control terminal of the second switching transistor Q2. The first end of the second switching transistor Q2 is connected to the communication interface COM1. An eighth resistor R8 with one end connected to the supply voltage is electrically connected between the first end of the second switching transistor Q2 and the communication interface COM1. The control terminal of the third switching transistor Q3 is connected to the receiving pin RX0 of the corresponding MCU through a sixth resistor R6. A seventh resistor R7 with one end connected to the supply voltage is electrically connected between the control terminal of the third switching transistor Q3 and the sixth resistor R6. The supply voltage is connected to the receiving pin RX0 of the corresponding MCU through a fifth resistor R5. The second end of the third switching transistor Q3 is connected to the receiving pin RX0 of the corresponding MCU. The first end of the third switching transistor Q3 is connected to the first end of the second switching transistor Q2 and the communication interface COM1. Herein, the corresponding MCU can be the MCU of the charger or the MCU of the battery pack.

[0014] Specifically, in this embodiment, the first switching transistor Q1 is a triode. The base of the first switching transistor Q1 is connected to the transmission pin TX0 of the corresponding MCU after passing through a second resistor R2. One end of the second resistor R2 is connected to the transmission pin TX0 of the corresponding MCU and one end of a first resistor R1. The other end of the first resistor R1 is connected to the supply voltage. The other end of the second resistor R2 is connected to one end of a third resistor R3 and the base of the first switching transistor Q1. The other end of the third resistor R3 is grounded. The emitter of the first switching transistor Q1 is grounded. The collector of the first switching transistor Q1 is connected to the other end of the ninth resistor R9, the control terminal of the second switching transistor Q2, and a tenth resistor R10 with one end grounded. Herein, the first switching transistor Q1 can adopt an NPN type triode.

[0015] Specifically, in this embodiment, the second switching transistor Q2 is an NMOS transistor. The gate of the second switching transistor Q2 is connected to the other end of the ninth resistor R9, the other end of the tenth resistor R10, and the collector of the first switching transistor Q1. The source of the second switching transistor Q2 is grounded. The drain of the second switching transistor Q2 is connected to the other end of the eighth resistor R8 and the communication interface COM1.

[0016] Specifically, in this embodiment, the third switching transistor Q3 is an NMOS transistor. The gate of the third switching transistor Q3 is connected to one end of the sixth resistor R6 and the other end of the seventh resistor R7. The other end of the sixth resistor R6 is connected to the receiving pin RX0 of the corresponding MCU. The source of the third switching transistor Q3 is connected to the receiving pin RX0 of the corresponding MCU. The drain of the third switching transistor Q3 is connected to the drain of the second switching transistor Q2, the other end of the eighth resistor R8, and the communication interface COM1. The anode of the parasitic diode of the third switching transistor Q3 is connected to the receiving pin RX0 of the corresponding MCU. The cathode of the parasitic diode of the third switching transistor Q3 is connected to the drain of the second switching transistor Q2, the other end of the eighth resistor R8, and the communication interface COM1.

[0017] Specifically, in this embodiment, the supply voltage is 5V.

[0018] Specifically, in this embodiment, the other end of the eighth resistor R8 is connected to one end of the transient voltage suppression diode SMF4, the first end of the second switching transistor Q2, the first end of the third switching transistor Q3, and the communication interface COM1. The other end of the transient voltage suppression diode SMF4 is grounded. That is, the other end of the eighth resistor R8 is connected to one end of the transient voltage suppression diode SMF4, the drain of the second switching transistor Q2, the drain of the third switching transistor Q3, and the communication interface COM1. The communication interface COM1 may include two pins, one of which is correspondingly connected to the charging communication circuit of the charger, and the other is correspondingly connected to the charging communication circuit of the battery pack.

[0019] Based on the above design, during operation, when the charging communication circuit receives the high-level signal output by the transmitting pin of the MCU, the first switching transistor is turned on, the second switching transistor is turned off and cut off, and the level of the communication interface is 5V high level; when the charging communication circuit receives the low-level signal output by the transmitting pin of the MCU, the first switching transistor is turned off and cut off, the second switching transistor is turned on, and the supply voltage is pulled down to realize the control of the communication interface. When the communication interface is at a low level, the parasitic diode of the third switching transistor is turned on, and the voltage of the receiving pin of the MCU is pulled down; when the communication interface is at a high level, the parasitic diode of the third switching transistor is cut off, the third switching transistor is also turned off and cut off, and the voltage of the receiving pin of the MCU is the supply voltage, realizing the data sending and receiving functions.

[0020] In summary, the charging communication circuit of the present utility model is connected to the MCU of the corresponding charger or the MCU of the battery pack, and the charging communication circuit electrically connected to the MCU of the charger is connected to the charging communication circuit electrically connected to the MCU of the battery pack through a communication interface, so that the charger and the battery pack share the communication interface and the charging communication circuits are connected, realizing the correct sending and receiving of data, with high data transmission security, enabling the charger and the battery pack to communicate with each other, thereby performing data exchange, realizing real-time monitoring of the state of the battery pack by the charger, and adjusting the charging according to the state of the battery pack to improve charging safety.

[0021] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A charging communication circuit, characterized in that, Applied to a charger and a battery pack, the MCU of the charger and the MCU of the battery pack are respectively connected to a charging communication circuit. The charging communication circuit electrically connected to the MCU of the charger is connected to the charging communication circuit electrically connected to the MCU of the battery pack through a communication interface. The communication interface includes two pins. One pin of the communication interface corresponds to and is connected to the charging communication circuit of the charger, and the other pin of the communication interface corresponds to and is connected to the charging communication circuit of the battery pack; The charging communication circuit includes a first switching tube, a second switching tube, and a third switching tube. The control end of the first switching tube is connected to the sending pin of the corresponding MCU. The output end of the first switching tube is connected to the control end of the second switching tube. A ninth resistor with one end connected to the supply voltage is electrically connected between the output end of the first switching tube and the control end of the second switching tube. The first end of the second switching tube is connected to the communication interface. An eighth resistor with one end connected to the supply voltage is electrically connected between the first end of the second switching tube and the communication interface. The control end of the third switching tube is connected to the receiving pin of the corresponding MCU through a sixth resistor. A seventh resistor with one end connected to the supply voltage is electrically connected between the control end of the third switching tube and the sixth resistor. The supply voltage is connected to the receiving pin of the corresponding MCU through a fifth resistor. The second end of the third switching tube is connected to the receiving pin of the corresponding MCU. The first end of the third switching tube is connected to the first end of the second switching tube and the communication interface.

2. The charging communication circuit according to claim 1, wherein The first switching tube is a triode. The base of the first switching tube is connected to the sending pin of the corresponding MCU after passing through a second resistor. One end of the second resistor is connected to the sending pin of the corresponding MCU and one end of a first resistor. The other end of the first resistor is connected to the supply voltage. The other end of the second resistor is connected to one end of a third resistor and the base of the first switching tube. The other end of the third resistor is grounded. The emitter of the first switching tube is grounded. The collector of the first switching tube is connected to the other end of the ninth resistor, the control end of the second switching tube, and a tenth resistor grounded at one end.

3. The charging communication circuit according to claim 2, wherein The second switching tube is an NMOS tube. The gate of the second switching tube is connected to the other end of the ninth resistor, the other end of the tenth resistor, and the collector of the first switching tube. The source of the second switching tube is grounded. The drain of the second switching tube is connected to the other end of the eighth resistor and the communication interface.

4. The charging communication circuit according to claim 3, wherein The third switching transistor is an NMOS transistor. The gate of the third switching transistor is connected to one end of the sixth resistor and the other end of the seventh resistor. The other end of the sixth resistor is connected to the receiving pin of the corresponding MCU. The source of the third switching transistor is connected to the receiving pin of the corresponding MCU. The drain of the third switching transistor is connected to the drain of the second switching transistor, the other end of the eighth resistor, and the communication interface. The anode of the parasitic diode of the third switching transistor is connected to the receiving pin of the corresponding MCU. The cathode of the parasitic diode of the third switching transistor is connected to the drain of the second switching transistor, the other end of the eighth resistor, and the communication interface.

5. The charging communication circuit according to claim 1, wherein The supply voltage is 5V.

6. The charging communication circuit according to claim 1, wherein The other end of the eighth resistor is connected to one end of the transient voltage suppression diode, the first end of the second switching transistor, the first end of the third switching transistor, and the communication interface. The other end of the transient voltage suppression diode is grounded.

7. The charging communication circuit according to claim 1, wherein The communication interface is a COM port.

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