Electric bicycle new national standard charger mutual identification communication interface common ground wire circuit

Abstract

The utility model discloses an electric bicycle new national standard charger mutual identification communication interface common ground wire circuit comprising a resistor R1 and a capacitor C. The resistor R1 and the capacitor C form a bootstrap charging circuit, and when a single-chip microcomputer outputs a high level, a voltage higher than a voltage on an anode of a silicon controlled rectifier Q1 is obtained on a circuit of a control electrode of the silicon controlled rectifier Q1; a capacitor and a resistor are added on the basis of a charging circuit in the prior art, the capacitor is charged by utilizing ingenious combination of the resistor, the capacitor and a main power supply, a potential higher than positive voltage of a charger is generated to trigger and control conduction of a silicon controlled rectifier, an auxiliary power supply in the prior art is replaced by utilizing bootstrap boost of the resistor and the capacitor, and the circuit is simplified.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electronics, in particular to a circuit for mutual recognition communication interface common ground wire of a new national standard charger for an electric bicycle. BACKGROUND

[0002] According to the new national standard "Electric Bicycle Electrical Safety Requirements" (GB 42295-2022) 4.8.9: the charger and the charged battery pack (system) should have mutual recognition and cooperation agreement. The battery pack charger should first recognize and cooperate with the charged battery pack (system), confirm the technical parameters of the battery pack, and then start charging.

[0003] However, in order to meet the requirement of "safe low voltage" in the standard, a "thyristor" is arranged at the negative output end of the charger. If it is still arranged in this way, the internal circuit of the charger and the bicycle system circuit cannot be common ground, which blocks the mutual information exchange.

[0004] Therefore, the "thyristor" must be connected to the positive output end from the negative output end. A potential higher than the positive potential of the charger is required to control the conduction of the "thyristor". The common practice in society is to increase an auxiliary winding on the main transformer of the charger to provide an auxiliary voltage. Figure 1 The circuit designed by the prior art to maintain the mutual recognition and cooperation agreement between the charger and the charged battery pack (system) includes a thyristor Q1 and an auxiliary power supply. An auxiliary winding is added to the main transformer of the charger to provide an auxiliary voltage to make the thyristor Q1 conductive, realize the intercommunication between the internal circuit of the charger and the bicycle system circuit, and connect the positive and negative ports of the communication interface and the power supply to the electric bicycle through the same output plug.

[0005] However, the above-mentioned prior art results in a complex circuit, increases electromagnetic radiation, and affects electromagnetic compatibility. Therefore, there is an urgent need for a circuit for mutual recognition communication interface common ground wire of a new national standard charger for an electric bicycle, which has a simple structure and replaces the auxiliary power supply that must be added in the prior art, so that the internal circuit of the charger and the bicycle system circuit can be common ground and maintain intercommunication. CONTENT OF THE INVENTION

[0006] To solve the above problems, the application provides a circuit for mutual recognition communication interface common ground wire of a new national standard charger for an electric bicycle, which adopts a unique connection method, uses the ingenious combination of resistance, capacitance and main power supply to charge the capacitor, generates a potential higher than the positive voltage of the charger, and triggers the control of the conduction of the "thyristor". The structure is simple and the auxiliary power supply must be replaced.

[0007] The technical scheme adopted by the application is:

[0008] The application provides a circuit of a new national standard charger mutual recognition communication interface common ground wire of an electric bicycle, which comprises a resistor R1 and a capacitor C, and the resistor R1 and the capacitor C constitute a bootstrap charging circuit.

[0009] Further, one end of the capacitor C of the bootstrap charging circuit is connected with the control electrode of the thyristor Q1 and one end of the resistor R1, and the other end is connected with the single-chip microcomputer; the main power supply is connected with the other end of the resistor R1 and the anode of the thyristor Q1.

[0010] Further, the bootstrap charging circuit further comprises a diode D2, the anode of the diode D2 is connected with the other end of the capacitor C and the control port of the single-chip microcomputer, and the cathode of the diode D2 is connected with the 5V power supply.

[0011] Further, the circuit further comprises an optical coupler, the optical coupler has an input end and an output end, the output end of the optical coupler is arranged between one end of the capacitor C and the control electrode of the thyristor Q1, and the input end of the optical coupler is connected with the other end of the capacitor C and then grounded.

[0012] Further, the circuit further comprises a resistor R2, one end of the resistor R2 is connected with the output end of the optical coupler, and the other end of the resistor R2 is connected with the control electrode of the thyristor Q1.

[0013] Further, the circuit further comprises a resistor R3, one end of the resistor R3 is connected with the input end of the optical coupler, and the other end of the resistor R3 is connected with the anode of the diode D2, the capacitor C and the control signal port of the single-chip microcomputer.

[0014] The application has the following beneficial effects:

[0015] The application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The circuit diagram is designed for the mutual recognition and cooperation protocol between the charger and the charged battery group (system) in the prior art.

[0017] Figure 2 The circuit diagram is designed for the mutual recognition and cooperation protocol between the charger and the charged battery group (system) in the prior art. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the application more clear, the technical scheme of the application will be described clearly and completely in combination with the drawings and a preferred embodiment.

[0019] REFERENCE Figure 2The embodiment provides a circuit for a new national standard charger of an electric bicycle, which is improved on the basis of the prior art circuit structure, wherein the prior art circuit comprises a single-chip microcomputer and a thyristor Q1, the embodiment adds a resistor R1 and a capacitor C to replace the original auxiliary power supply, the resistor R1 and the capacitor C form a bootstrap charging circuit, one end of the capacitor C of the bootstrap charging circuit is connected with the control electrode of the thyristor Q1 and one end of the resistor R1, the other end is connected with the single-chip microcomputer, the main power supply is connected with the other end of the resistor R1 and the anode of the thyristor Q1, the cathode of the thyristor Q1 is connected with the positive electrode of the battery, and the single-chip microcomputer is further connected with the negative electrode of the battery; when the single-chip microcomputer is at a low level, the capacitor C is charged to the power supply voltage through the resistor R1, and when the single-chip microcomputer is at a high level, since the cathode of the thyristor Q1 is connected with the battery and is lower than the charging voltage, a turn-on voltage is obtained on the control electrode of the thyristor Q1, so that a voltage higher than that on the anode of the thyristor is obtained on the circuit of the control electrode of the thyristor, and the thyristor Q1 is turned on.

[0020] More specifically, when the thyristor Q1 is not turned on and the single-chip microcomputer does not give a turn-on control signal, the capacitor C is at a low level, Figure 2 When the single-chip microcomputer is at a low level, the point B is charged to the main power supply voltage by the resistor R1, and then the voltage value of the capacitor C reaches the voltage value of the main power supply; when the single-chip microcomputer gives a turn-on control signal, i.e., a high level of 5V, the point A in the figure 2 is raised from 0V to 5V at a high level, so that the circuit of the control electrode of the thyristor is raised by 5V higher than the anode, and the 5V voltage rise is a so-called bootstrap voltage, the thyristor Q1 is turned on, and the internal circuit of the charger and the bicycle system circuit are interconnected.

[0021] Preferably, the bootstrap charging circuit further comprises a diode D2, the anode of the diode D2 is connected with the control port of the single-chip microcomputer, and the cathode of the diode D2 is connected with the +5V power supply, so that the voltage does not exceed 5V plus the turn-on voltage value of 0.7V of the diode D2, and the control port of the single-chip microcomputer is protected.

[0022] Preferably, the circuit further comprises an optical coupler and a diode D1, the optical coupler has an input end and an output end, the input end of the optical coupler adopts a light-emitting diode, and the output end adopts a triode, the output end of the optical coupler is arranged between one end of the capacitor C and the control electrode of the thyristor Q1, i.e., the collector of the triode of the optical coupler is connected with one end of the capacitor C, the emitter of the triode of the optical coupler is connected with the control electrode of the thyristor Q1, the input end of the optical coupler is connected with the other end of the capacitor C and then grounded, i.e., the anode of the diode of the optical coupler is connected with the other end of the capacitor C, and the cathode of the diode of the optical coupler is grounded, the connection between the optical coupler and the thyristor Q1 controls the signal through an optical signal, and electrical isolation between the input and the output is realized; the anode of the diode D1 is connected with the main power supply for rectification, and the cathode is connected with other devices in the circuit.

[0023] Preferably, the circuit further comprises a resistor R2 and a resistor R3, the resistor R2 is arranged between the output of the optocoupler and the control electrode of the thyristor Q1, one end of the resistor R3 is connected to the anode of the diode of the optocoupler, and the other end is connected to the anode of the diode D2, the capacitor C and the control signal port of the single-chip microcomputer, and the resistors R2 and R3 are respectively used for protecting the control electrode of the thyristor Q1 and the control signal port of the single-chip microcomputer.

[0024] The embodiment increases the capacitor C and the resistor R1 on the basis of the prior art charging circuit, uses the resistor R1, the capacitor C and the main power supply to charge the capacitor C, generates a potential higher than the positive voltage of the charger to trigger the conduction of the thyristor Q1, and uses the resistor-capacitor bootstrap to replace the auxiliary power supply, thereby simplifying the circuit.

[0025] The above only describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements are also within the protection scope of the present application.

Claims

1. A circuit for a common ground wire in the communication interface of a new national standard charger for electric bicycles, characterized in that, The circuit includes a resistor R1 and a capacitor C, which together form a bootstrap charging circuit. When the microcontroller outputs a high level, a voltage higher than that on the anode of the thyristor Q1 is obtained on the circuit at the control electrode of the thyristor Q1. One end of the capacitor C in the bootstrap charging circuit is connected to the control electrode of the thyristor Q1 and one end of the resistor R1, while the other end is connected to the microcontroller. The main power supply is connected to the other end of the resistor R1 and the anode of the thyristor Q1. The bootstrap charging circuit also includes a diode D2. The anode of the diode D2 is connected to the other end of the capacitor C and the control port of the microcontroller, while the cathode of the diode D2 is connected to the 5V power supply.

2. The circuit with a common ground wire for the communication interface of the new national standard charger for electric bicycles according to claim 1, characterized in that, It also includes an optocoupler, which has an input terminal and an output terminal. The output terminal of the optocoupler is located between one end of the capacitor C and the control electrode of the thyristor Q1, and the input terminal of the optocoupler is connected to the other end of the capacitor C and then grounded.

3. The circuit with a common ground wire for the communication interface of the new national standard charger for electric bicycles according to claim 2, characterized in that, It also includes resistor R2, one end of which is connected to the output terminal of the optocoupler, and the other end of which is connected to the control electrode of the thyristor Q1.

4. The circuit with a common ground wire for the communication interface of the new national standard charger for electric bicycles according to claim 2, characterized in that, It also includes resistor R3, one end of which is connected to the input terminal of the optocoupler, and the other end is connected to the anode of diode D2, capacitor C, and the control signal port of the microcontroller.

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