Overvoltage detection system for vehicle motor controller

Abstract

The utility model relates to the technical field of controllers, in particular to an overvoltage detection system for a vehicle motor controller, which comprises a main control processor, a power supply module, a three-phase full-bridge inverter circuit and an overvoltage detection module. The output end of the Hall detection sensor is electrically connected with the current and voltage conversion circuit, and the current and voltage conversion circuit is electrically connected with the voltage comparison circuit. The non-intrusive overvoltage detection of the three-phase full-bridge inverter circuit is realized through the Hall detection sensor, and the influence on the circuit performance in the detection process is effectively avoided. The Hall detection sensor performs current detection by using a Hall effect without directly accessing a circuit, so that additional power consumption is not introduced or the current characteristic of the circuit is not changed.

Description

Technical Field

[0001] The utility model relates to the technical field of controllers, in particular to an overvoltage detection system for a vehicle motor controller. Background Art

[0002] The motor controller is one of the key components of electric vehicles. As one of the core components of the electric vehicle's driving control system, it is mainly responsible for accurately controlling the motor's starting, acceleration, deceleration, and stopping operations, thereby ensuring that the electric vehicle can travel smoothly and efficiently.

[0003] During the operation of the electric vehicle motor, the motor controller must provide high current and voltage to drive the motor to meet the needs of complex road conditions such as climbing. However, long-term high current output will affect the stability and reliability of the motor controller. Therefore, voltage monitoring of the motor controller is particularly critical. However, in the existing technology, overvoltage monitoring of the motor controller is usually directly monitored using the resistor divider method. Although the circuit structure of the resistor divider method is relatively simple, a certain amount of energy loss will be generated during the monitoring process, which will cause the current in the monitored circuit to change, thereby affecting the accuracy of the monitoring results. In addition, the consumption of current in the monitored circuit will cause the output voltage of the motor controller to change, which in turn affects the normal drive of the motor and aggravates the overvoltage output phenomenon of the motor controller in complex environments such as climbing. Utility Model Content

[0004] To solve the above problems, the present invention provides a vehicle motor controller overvoltage detection system, including a main control processor, a power supply module, a three-phase full-bridge inverter circuit, and an overvoltage detection module. The overvoltage detection module includes a Hall detection sensor, a current-voltage conversion circuit, and a voltage comparison circuit. The output end of the Hall detection sensor is electrically connected to the current-voltage conversion circuit, and the current-voltage conversion circuit is electrically connected to the voltage comparison circuit.

[0005] The power supply module is electrically connected to the main control processor and the three-phase full-bridge inverter circuit respectively; the main control processor is electrically connected to the three-phase full-bridge inverter circuit, the output end of the three-phase full-bridge inverter circuit is connected to the input end of the overvoltage detection module, and the output end of the overvoltage detection module is electrically connected to the main control processor.

[0006] In order to realize conversion and amplification of the detection signal of the Hall detection sensor, the current-voltage conversion circuit includes a current conversion circuit and a differential amplifier circuit; the output end of the current conversion circuit is electrically connected to the input end of the differential amplifier circuit.

[0007] In a specific embodiment, the current conversion circuit includes resistors R1-R5 and an operational amplifier U1; the positive input terminal of the operational amplifier U1 is connected to one end of resistors R2 and R4 respectively, the other end of the resistor R4 is grounded, and the other end of the resistor R2 is connected to R1; the negative input terminal of the operational amplifier U1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the resistor R1; the output terminal of the operational amplifier U1 is connected to the negative input terminal via the resistor R5.

[0008] The differential amplifier circuit includes resistors R6-R8 and an operational amplifier U2; the positive input terminal of the operational amplifier U2 is connected to the resistor R6, and the series node of the positive input terminal of the operational amplifier U2 and R6 is connected to R8 and grounded; the negative input terminal of the operational amplifier U2 is connected to the resistor R7.

[0009] In order to achieve non-invasive detection, the Hall effect detection sensor includes a Hall element and an instrument amplifier. The Hall element is electrically connected to the instrument amplifier and can use the Hall effect to detect current without directly connecting to the circuit.

[0010] In a specific embodiment, the Hall element model is HW300B.

[0011] The instrument amplifier model is AD620.

[0012] In order to realize overvoltage judgment of voltage signal, the voltage comparison circuit includes an operational amplifier U3, diodes D1 and D2, and a resistor R9. The positive input terminal of the operational amplifier U3 is connected to the output terminal of the current-voltage conversion circuit, and the reverse output terminal of the operational amplifier U3 is connected to the reference voltage; the output terminal of the operational amplifier U3 is connected to the main control processor via the diode D2, one end of the resistor R9 is connected to the 5V power supply, and the other end is connected to the output terminal of the operational amplifier U3, and at the same time is connected to the positive input terminal of the operational amplifier U3 through the diode D1.

[0013] The three-phase full-bridge inverter circuit is provided with three-phase connection terminals and is externally connected to a motor via a three-phase transmission line.

[0014] At least three Hall detection sensors are provided, which are respectively arranged at the three-phase connection terminals of the three-phase full-bridge inverter circuit.

[0015] The beneficial effects are as follows: the utility model is a vehicle motor controller overvoltage detection system, which realizes non-invasive overvoltage detection of the three-phase full-bridge inverter circuit through the Hall detection sensor, effectively avoiding the impact on the circuit performance during the detection process. The Hall detection sensor uses the Hall effect to detect current and does not need to be directly connected to the circuit, so it does not introduce additional power consumption or change the current characteristics of the circuit. In addition, through the coordinated use of the current-voltage conversion circuit and the voltage comparison circuit, the system can accurately convert the detected current signal into a voltage signal and compare it with the preset reference voltage, thereby realizing real-time monitoring of overvoltage conditions. When overvoltage is detected, the system can promptly send a warning signal to the main control processor, prompting the main control processor to take voltage reduction measures to ensure the safe and stable operation of the motor controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the vehicle motor controller overvoltage detection system;

[0017] Figure 2 This is the current-voltage conversion circuit diagram;

[0018] Figure 3 This is the voltage comparison circuit diagram. DETAILED DESCRIPTION

[0019] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0020] See also Figure 1 This embodiment provides an overvoltage detection system for a vehicle motor controller, comprising a main control processor, a power supply module, a three-phase full-bridge inverter circuit, and an overvoltage detection module. The power supply module is electrically connected to the main control processor and the three-phase full-bridge inverter circuit, respectively. The power supply module is connected to an external power source to provide power to the entire motor controller. The main control processor is electrically connected to the three-phase full-bridge inverter circuit, the output of which is connected to the input of the overvoltage detection module, and the output of which is electrically connected to the main control processor.

[0021] The three-phase full-bridge inverter circuit is equipped with three-phase terminals and is connected to an external motor via a three-phase transmission line. The overvoltage detection module is connected to each of the three-phase terminals of the three-phase full-bridge inverter circuit. The three-phase full-bridge inverter circuit receives the output signal of the main control processor to switch the MOS driver transistors to generate a PWM control signal for driving the motor. It then connects to the power supply module to convert DC power into AC power, which is then transmitted to the motor for power supply. The overvoltage detection module collects the output voltage signal of the three-phase full-bridge inverter circuit and performs overvoltage detection.

[0022] To ensure that the overvoltage detection module does not affect the circuit being detected, the overvoltage detection module includes a Hall effect detection sensor, a current-voltage conversion circuit, and a voltage comparison circuit. At least three Hall effect detection sensors are provided, each located at the three-phase connection terminals of the three-phase full-bridge inverter circuit. The Hall effect detection sensor is not connected to the three-phase full-bridge inverter circuit and can detect the current flowing through the three-phase full-bridge inverter circuit through the Hall effect, thereby generating no power consumption during the detection process and causing no current changes in the three-phase full-bridge inverter circuit. The Hall effect detection sensor includes a Hall element and an instrument amplifier, which are electrically connected to the instrument amplifier. The Hall element model is HW300B, and the instrument amplifier model is AD620.

[0023] The output end of the Hall detection sensor is electrically connected to a current-voltage conversion circuit, which can convert current signals into voltage signals and amplify the signals. The current-voltage conversion circuit includes a current conversion circuit and a differential amplifier circuit. The current conversion circuit includes resistors R1-R5 and an operational amplifier U1; the differential amplifier circuit includes resistors R6-R8 and an operational amplifier U2. The positive input end of the operational amplifier U1 is connected to one end of resistors R2 and R4 respectively, the other end of the resistor R4 is grounded, and the other end of the resistor R2 is connected to R1; the negative input end of the operational amplifier U1 is connected to one end of resistor R3, the other end of the resistor R3 is connected to resistor R1, and the output end of the Hall detection sensor is connected to both ends of resistor R1; the output end of the operational amplifier U1 is connected to the negative input end via resistor R5.

[0024] The positive input terminal of the operational amplifier U2 in the differential amplifier circuit is connected to the output terminal of the operational amplifier U1 via the resistor R6, and the series node of the positive input terminal of U2 and R6 is connected to R8 and grounded; the negative input terminal of the operational amplifier U2 is connected to the resistor R7.

[0025] In order to perform overvoltage detection on the detection signal of the three-phase full-bridge inverter circuit, the current-voltage conversion circuit is electrically connected to the voltage comparison circuit, which includes an operational amplifier U3, diodes D1 and D2, and a resistor R9. The positive input terminal of the operational amplifier U3 is connected to the output terminal of the differential amplifier circuit U2, and the reverse output terminal of the operational amplifier U3 is connected to the reference voltage; the output terminal of the operational amplifier U3 is connected to the main control processor via the diode D2, one end of the resistor R9 is connected to the 5V power supply, and the other end is connected to the output terminal of the operational amplifier U3, and is also connected to the positive input terminal of the operational amplifier U3 through the diode D1. The voltage comparison circuit compares the output voltage of the current-voltage conversion circuit with the reference voltage. When the output voltage is greater than the reference voltage, the output end of the voltage comparison circuit can transmit a high level to the GPIO pin of the main control processor, indicating that the output voltage of the current three-phase full-bridge inverter circuit is overvoltage. The main control processor thereby controls the output signal to perform a step-down operation to reduce the output voltage of the three-phase full-bridge inverter circuit. When the output voltage compared by the output end of the voltage comparison circuit is less than the reference voltage, the output high level becomes a low level and cannot be turned on by the diode. The main control processor no longer receives the detection signal of the overvoltage detection module.

Claims

1. A vehicle motor controller overvoltage detection system, comprising a main control processor, a power supply module, and a three-phase full-bridge inverter circuit, characterized in that: The overvoltage detection module includes a Hall detection sensor, a current-voltage conversion circuit, and a voltage comparison circuit, wherein the output end of the Hall detection sensor is electrically connected to the current-voltage conversion circuit, and the current-voltage conversion circuit is electrically connected to the voltage comparison circuit; The power supply module is electrically connected to the main control processor and the three-phase full-bridge inverter circuit respectively; the main control processor is electrically connected to the three-phase full-bridge inverter circuit, the output end of the three-phase full-bridge inverter circuit is connected to the input end of the overvoltage detection module, and the output end of the overvoltage detection module is electrically connected to the main control processor.

2. The vehicle motor controller overvoltage detection system according to claim 1, characterized in that: The current-voltage conversion circuit includes a current conversion circuit and a differential amplifier circuit; the output end of the current conversion circuit is electrically connected to the input end of the differential amplifier circuit.

3. The vehicle motor controller overvoltage detection system according to claim 2, characterized in that: The current conversion circuit includes resistors R1-R5 and an operational amplifier U1; the positive input terminal of the operational amplifier U1 is connected to one end of resistors R2 and R4 respectively, the other end of the resistor R4 is grounded, and the other end of the resistor R2 is connected to R1; the negative input terminal of the operational amplifier U1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the resistor R1; the output terminal of the operational amplifier U1 is connected to the negative input terminal via the resistor R5.

4. The vehicle motor controller overvoltage detection system according to claim 2, characterized in that: The differential amplifier circuit includes resistors R6-R8 and an operational amplifier U2; the positive input terminal of the operational amplifier U2 is connected to the resistor R6, and the series node of the positive input terminal of the operational amplifier U2 and R6 is connected to R8 and grounded; the negative input terminal of the operational amplifier U2 is connected to the resistor R7.

5. The vehicle motor controller overvoltage detection system according to claim 1, characterized in that: The Hall detection sensor includes a Hall element and an instrument amplifier, and the Hall element is electrically connected to the instrument amplifier.

6. The vehicle motor controller overvoltage detection system according to claim 5, characterized in that: The Hall element model is HW300B.

7. The vehicle motor controller overvoltage detection system according to claim 5, characterized in that: The instrument amplifier model is AD620.

8. The vehicle motor controller overvoltage detection system according to claim 1, characterized in that: The voltage comparison circuit includes an operational amplifier U3, diodes D1 and D2, and a resistor R9. The positive input terminal of the operational amplifier U3 is connected to the output terminal of the current-voltage conversion circuit, and the reverse output terminal of the operational amplifier U3 is connected to the reference voltage; the output terminal of the operational amplifier U3 is connected to the main control processor via the diode D2, one end of the resistor R9 is connected to the 5V power supply, and the other end is connected to the output terminal of the operational amplifier U3, and is also connected to the positive input terminal of the operational amplifier U3 through the diode D1.

9. The vehicle motor controller overvoltage detection system according to claim 1, characterized in that: The three-phase full-bridge inverter circuit is provided with three-phase wiring terminals, and the three-phase wiring terminals are externally connected to a motor via a three-phase transmission line.

10. The vehicle motor controller overvoltage detection system according to claim 9, characterized in that: At least three Hall detection sensors are provided, which are respectively arranged at the three-phase connection terminals of the three-phase full-bridge inverter circuit.

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