A battery charging circuit with anti-interference communication function

Abstract

The utility model discloses a battery charging circuit with anti -interference communication function is used for two -wheeled electric vehicle charging, and battery charging circuit includes transformer, main control chip, the primary coil of transformer is connected outside power supply, and the weak electric output circuit that has of secondary coil on transformer is connected, and weak electric output circuit is used for providing input current for main control chip work and battery charging, still includes, anti -interference communication circuit is used for with the battery end on two -wheeled electric vehicle communication, solved the problem that the existing charging circuit lacks limited anti -interference design, leads to the problem that the normal charging of communication signal exists beat influence.

Description

Technical Field

[0001] This application relates to a charging circuit, and more particularly to a battery charging circuit with anti-interference communication function. Background Technology

[0002] With the mandatory implementation of the new national standard for electric bicycles, the industry has put forward higher requirements for the safety and standardization of electric bicycle charging. Among them, it is clearly stipulated that the control circuit of the electric bicycle must maintain stable communication with the charger during the charging process in order to realize functions such as charging status monitoring, parameter adjustment and abnormal protection, so as to ensure the safety and reliability of the charging process.

[0003] Currently, lead-acid batteries are widely used as the power source for ordinary household electric two-wheelers. However, during the charging process, the internal switching power supply of lead-acid batteries generates strong electromagnetic interference. This interference signal is directly coupled to the communication connection line between the control circuit and the charger, resulting in complex interference waveforms superimposed on the communication line, which seriously damages the integrity of the communication signal. Improvements are proposed to address this issue. Utility Model Content

[0004] This utility model discloses a battery charging circuit with anti-interference communication function, which solves the problem that the lack of limited anti-interference design in existing charging circuits leads to noise in the communication signal affecting normal charging.

[0005] A battery charging circuit with anti-interference communication function is used for charging a two-wheeled electric vehicle. The battery charging circuit includes a transformer and a main control chip. The primary coil of the transformer is connected to an external power source. A low-voltage output circuit is connected to the secondary coil of the transformer. The low-voltage output circuit is used to provide input current for the operation of the main control chip and for battery charging. The circuit also includes an anti-interference communication circuit for communicating with the battery terminal of the two-wheeled electric vehicle.

[0006] This application includes an anti-interference communication circuit for communicating with the battery terminal of a two-wheeled electric vehicle, which can isolate interference signals.

[0007] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0008] Optionally, the battery charging circuit further includes a charging mode isolation control circuit, and a high-voltage drive control circuit is provided on the primary coil of the transformer. The charging mode isolation control circuit is connected to the main control chip and is used to control the input power of the high-voltage drive control circuit.

[0009] Optionally, the anti-interference communication circuit includes a signal input terminal for sending signals to the battery terminal and a signal output terminal for receiving signals from the battery terminal. The signal output terminal is provided with an optocoupler for filtering noise when receiving signals.

[0010] Optionally, the feature is that the positive terminals of the light-emitting diode and the phototransistor on the optocoupler are both connected to a 5V power supply, and the switching on and off of the light-emitting diode is controlled by the battery terminal to form an input signal, and controls the switching on and off of the phototransistor to form an output signal.

[0011] Optionally, the output signal is characterized by using the high or low potential of the positive electrode of the phototransistor on the optocoupler.

[0012] Optionally, the signal output terminal sends an input signal to the battery terminal, and controls transistors Q100 and Q101 to conduct by controlling the input signal, thereby forming an output signal at the battery terminal.

[0013] The beneficial effects of this application are as follows:

[0014] 1. In this application, an optocoupler is set on the signal output terminal to isolate the input signal from the output signal by current. This can treat the circuits containing the input signal and the output signal as two independent loops, thus achieving the functions of isolation and anti-interference.

[0015] 2. In this application, both the phototransistor and the positive terminal of the LED in the optocoupler are connected to a 5V power supply. The current in the LED flows from the signal input terminal to the battery terminal, and the battery terminal controls the conduction of the LED. This can be understood as the LED being located upstream of the circuit containing the input signal, while the interference source (power supply circuit) is located downstream of the circuit containing the input signal, thereby reducing interference. Attached Figure Description

[0016] Figure 1 This is a high-power drive control circuit in one embodiment of the present application;

[0017] Figure 2 This is a low-voltage output circuit in one embodiment of this application;

[0018] Figure 3 This is the main control chip circuit in one embodiment of this application;

[0019] Figure 4 This is a charging mode isolation control circuit in one embodiment of the present application;

[0020] Figure 5 This is an anti-interference communication circuit in one embodiment of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] refer to Figures 1 to 5 One embodiment of this application discloses a battery charging circuit with anti-interference communication function, used to charge the battery after being connected to a two-wheeled electric vehicle. It includes a transformer, a main control chip, a communication circuit controlled by the main control chip, and a charging mode isolation circuit.

[0025] The primary coil of the transformer is connected to an external power source, and the secondary coil of the transformer is connected to a low-voltage output circuit, which provides operating current to the downstream circuit.

[0026] For details, please refer to Figure 2 The low-voltage output circuit provides power for battery charging, the main control chip, and various low-current circuits.

[0027] Further reference Figure 1 and Figure 4 A high-voltage drive control circuit is set on the primary coil of the transformer. At least two charging modes are programmed into the main control chip. The main control chip controls the high-voltage drive control circuit to change the input power through the charging mode isolation circuit, thereby completing the conversion of the charging mode.

[0028] In one embodiment, reference Figure 5 The communication circuit has a signal output terminal RXD and a signal input terminal TXD. The signal communication circuit communicates with the battery terminal through the K-line and is used to send or receive signals.

[0029] refer to Figure 5To avoid power line interference and output noise, an optocoupler is installed at the signal output terminal RXD. The input signal from the battery terminal controls the light-emitting diode on the optocoupler to conduct, which in turn controls the phototransistor to conduct and disconnect to form the output signal, thereby stabilizing the output signal.

[0030] Furthermore, to further reduce interference, both the phototransistor and the positive terminal of the LED in the optocoupler are connected to a 5V power supply. Current flows from the signal input terminal to the battery terminal, and the battery terminal controls the LED's conduction. This can be understood as the LED being upstream of the circuit containing the input signal, while the interference source (power supply circuit) is downstream, thus reducing interference.

[0031] In a specific implementation, the signal output terminal RXD uses the high or low potential of the positive terminal of the phototransistor on the optocoupler as the output signal. When the phototransistor is turned on, the signal output terminal RXD outputs a low level, and vice versa.

[0032] To facilitate understanding, the specific working principle of the communication circuit in the application can be explained as follows: Figure 5 The mirror image, with the battery end on one side, belongs to the circuitry section inside the electric vehicle.

[0033] The output signal at the signal output terminal RXD is controlled by the conduction of the signal input terminal at the battery terminal; while the signal output terminal at the battery terminal is similarly controlled by the conduction of the signal input terminal TXD.

[0034] A PNP transistor and an NPN transistor are installed on the signal input / output terminal TXD to ensure that the input and output signals have the same high and low levels. When a low level is input to the signal input / output terminal TXD, transistor Q101 is turned on, making the current in the circuit containing the LED non-zero, thereby generating the output signal.

[0035] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0036] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A battery charging circuit with anti-interference communication function for charging a two-wheeled electric vehicle, the battery charging circuit comprising a transformer and a main control chip, wherein the primary coil of the transformer is connected to an external power supply, and a low-voltage output circuit is connected to the secondary coil of the transformer, the low-voltage output circuit being used to provide input current for the operation of the main control chip and for battery charging, characterized in that... It also includes an anti-interference communication circuit, which is used to communicate with the battery terminal on the two-wheeled electric vehicle.

2. The battery charging circuit with anti-interference communication function according to claim 1, characterized in that, The battery charging circuit also includes a charging mode isolation control circuit. A high-voltage drive control circuit is provided on the primary coil of the transformer. The charging mode isolation control circuit is connected to the main control chip and is used to control the input power of the high-voltage drive control circuit.

3. A battery charging circuit with anti-interference communication function according to claim 2, characterized in that, The anti-interference communication circuit includes a signal input terminal that sends signals to the battery terminal and a signal output terminal that receives signals from the battery terminal. An optocoupler is provided on the signal output terminal to filter out noise when receiving signals.

4. A battery charging circuit with anti-interference communication function according to claim 3, characterized in that, The positive terminals of the light-emitting diode and the phototransistor on the optocoupler are both connected to a 5V power supply. The switching on and off of the light-emitting diode is controlled by the battery terminal to form an input signal, and controls the switching on and off of the phototransistor to form an output signal.

5. A battery charging circuit with anti-interference communication function according to claim 4, characterized in that, The high or low potential of the positive electrode of the phototransistor on the optocoupler is used as the output signal.

6. A battery charging circuit with anti-interference communication function according to claim 5, characterized in that, The signal output terminal sends an input signal to the battery terminal. By controlling the input signal, transistors Q100 and Q101 are turned on, thus generating an output signal at the battery terminal.

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