Over-current detection circuit and over-current protection circuit

An overcurrent protection circuit and overcurrent detection technology, applied in the field of circuits, can solve problems such as inability to capture system overcurrent signals in time, difficult motor protection, etc., to achieve rapid response, avoid potential safety hazards, and avoid failure to protect in time.

Active Publication Date: 2014-01-08
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But in above-mentioned prior art, the applicant finds, and the protection technology when the fault such as overcurrent, overvoltage occurs of existing motor controller, just does overcurrent, overvoltage to the system through the software program in the main control chip such as D

Method used

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  • Over-current detection circuit and over-current protection circuit
  • Over-current detection circuit and over-current protection circuit
  • Over-current detection circuit and over-current protection circuit

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Embodiment 1

[0051] figure 1 It is a schematic diagram of an overcurrent detection circuit provided in the embodiment of the present application.

[0052] refer to figure 1 As shown, an overcurrent detection circuit provided in the embodiment of the present application includes:

[0053] The current sensor 1 is used to collect the current analog signal output by the motor power module;

[0054]In this embodiment of the application, the motor is usually a permanent magnet synchronous motor of an electric vehicle, and the AC current of the motor power module is collected by a Hall-type current sensor and converted into an analog voltage signal that can be input into an operational amplifier.

[0055] The current signal processing circuit 2 is connected with the current sensor 1, converts the current analog signal collected by the current sensor 1 into a measurable voltage signal of the operational amplifier, and performs filtering and isolation to output a voltage value;

[0056] In the e...

Embodiment 2

[0062] figure 2 It is a schematic diagram of a current signal processing circuit in an overcurrent detection circuit provided by an embodiment of the present application.

[0063] refer to figure 2 As shown, a current signal processing circuit in an overcurrent detection circuit provided in an embodiment of the present application includes:

[0064] The current input terminal I_IN is connected to the current sensor;

[0065] a first resistor R1, the first end of the first resistor R1 is connected to the current input terminal I_IN, and the second end of the first resistor R1 is grounded;

[0066] a second resistor R2, the first end of the second resistor R2 is connected to the current input terminal I_IN;

[0067] a first capacitor C1, the first end of the first capacitor C1 is connected to the second end of the second resistor R2, and the second end of the first capacitor C1 is grounded;

[0068] a third resistor R3, the first end of the third resistor R3 is connected t...

Embodiment 3

[0074] image 3 It is a schematic diagram of a current comparison circuit in an overcurrent detection circuit provided in an embodiment of the present application.

[0075] refer to image 3 As shown, a current comparison circuit in an overcurrent detection circuit provided in an embodiment of the present application includes:

[0076] The voltage input terminal COM_I is connected to the output terminal of the current signal processing circuit 2;

[0077] A fourth resistor R4, the first end of the fourth resistor R4 is connected to the voltage input terminal COM_I;

[0078] A fifth resistor R5, the first terminal of the fifth resistor R5 is used to input the reference voltage upper limit value Vref+;

[0079] A sixth resistor R6, the first terminal of the sixth resistor R6 is used to input the reference voltage lower limit value Vref-;

[0080] A seventh resistor R7, the first end of the seventh resistor R7 is connected to the voltage input terminal COM_I;

[0081] The fi...

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Abstract

The invention discloses an over-current detection circuit and an over-current protection circuit. The over-current detection circuit comprises a current sensor, a current signal processing circuit and a current comparison circuit, wherein the current sensor is used for collecting current analog signals output by a motor power module, the current signal processing circuit is connected with the current sensor, converts the current analog signals collected by the current sensor into voltage signals capable of being measured by an operation amplifier, carries out filtering and isolation, and outputs the voltage value; the current comparison circuit is connected with the current signal processing circuit, compares the voltage value output by the current signal processing circuit with the preset reference voltage upper limit value and the reference voltage lower limit value, judges whether the voltage value exceeds the preset reference voltage upper and lower limit range or not, and outputs detection results. The analog signals are collected through the current sensor, the collected analog signals are sent to the current signal processing circuit, whether the over current occurs or not is detected through a comparator, the hardware is adopted for realizing the fast response of the current over flow fault, and the timely protection can be realized on the motor power module.

Description

technical field [0001] The present application relates to the field of circuit technology, in particular to an overcurrent detection circuit and an overcurrent protection circuit. Background technique [0002] As energy issues and environmental issues become increasingly prominent, the advantages of electric vehicles (including electric vehicles and electric bicycles) are increasingly accepted by people. Motors and motor controllers are the core components of electric vehicles, and their reliability is closely related to the personal and life safety of users. Therefore, it is particularly important to ensure the reliability of electric vehicle motors and motor controllers. [0003] In the prior art, electric vehicles generally use a permanent magnet synchronous motor as a drive motor, and the rotation of the permanent magnet synchronous motor is controlled by a motor controller, and a power module is used as a mainstream switching device in the motor controller. During the ...

Claims

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Application Information

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IPC IPC(8): G01R19/25H02H3/08
Inventor 贾俊玲滕波范旭红陈健郑碧红
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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