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Circuit and method for MOS tube self inspection of three-phase brushless direct current motor

A brushless DC motor and MOS tube technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of low safety and time-consuming detection, and achieve the effects of improved safety performance, low cost, and avoiding damage

Active Publication Date: 2018-07-17
HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a MOS tube self-inspection circuit and method for a three-phase DC brushless motor, aiming at solving the problems of low security and time-consuming detection of the existing MOS tube self-inspection scheme for a DC brushless motor

Method used

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  • Circuit and method for MOS tube self inspection of three-phase brushless direct current motor
  • Circuit and method for MOS tube self inspection of three-phase brushless direct current motor
  • Circuit and method for MOS tube self inspection of three-phase brushless direct current motor

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Embodiment A

[0051] How to judge whether the MOS transistors Q1, Q3, and Q5 are short-circuited is described in detail below.

[0052] In the embodiment of the present invention, in a specific implementation of the reference voltage unit, the MCU as the control unit respectively makes the output terminal volt_ceter of the reference voltage unit output the reference voltage through the resistors R4 and R6 on the reference voltage unit, specifically The implementation is as follows:

[0053] The MCU program controls the I / O pin connected to the resistor R4, and connects the resistor R4 to the pull-up resistor inside the MCU; the MCU program controls the I / O pin connected to the resistor R6, connects the resistor R6 to GND, and the resistor R4, The other end of R6 is a common terminal, and is connected to the output terminal volt_ceter of the reference voltage unit, so that the output terminal volt_ceter of the reference voltage unit forms a reference voltage, for example, the reference volta...

Embodiment B

[0061] How to determine whether the MOS transistors Q2, Q4, and Q6 are short-circuited will be described in detail below.

[0062] In the embodiment of the present invention, the MCU uses the resistors R4 and R6 on the reference voltage unit to make the volt_ceter output the reference voltage, and the way to detect whether Q2 is short-circuited is as follows:

[0063] The MCU program controls the I / O pin connected to the resistor R4, and connects the resistor R4 to GND; the MCU program controls the I / O pin connected to the resistor R6, and connects the resistor R6 to the pull-up resistor inside the MCU; make the volt_ceter The voltage is about 0.095V (to simplify the analysis, 0.095V is only the voltage division result of resistor R4 and resistor R6, and other voltage division networks are ignored).

[0064] If both Q1 and Q2 MOS tubes are good, then the voltage at the phase line phase_U is about 1.3V after 15V is divided by the bootstrap diode D1, the voltage dividing resisto...

Embodiment C

[0075] The following details how to detect whether Q1, Q3, and Q5 are open.

[0076] In the embodiment of the present invention, if a short circuit is detected after the MOS tube short circuit detection process is completed, an error prompt will be issued, indicating that there is a problem with the circuit, and the open circuit detection will not be performed further down. If no short circuit is detected, the MOS tube will be further detected. Whether the tube is open.

[0077] Here we still take Q1 as an example, and the details are as follows:

[0078] In a specific implementation of the reference voltage unit, the MCU makes the output terminal volt_ceter of the reference voltage unit output the reference voltage through the resistors R4 and R6 on the reference voltage unit respectively.

[0079] The MCU makes the volt_ceter output the reference voltage through the resistor R4 and the resistor R6. In detail, the MCU program controls the I / O pin connected to the resistor R...

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Abstract

The present invention is suitable for the motor field, and provides a circuit and a method for MOS tube self inspection of a three-phase brushless direct current motor. The circuit comprises a controlunit and a drive circuit having three-phase drive bridge arms, each drive bridge arm comprises one bootstrap circuit connected with the MOS tube of each drive bridge arm, each bootstrap circuit at least comprises one bootstrap diode, one bootstrap capacitor and one drive chip; each drive bridge arm comprises one voltage division resistor for self inspection and one sampling resistor which are connected in parallel with each bootstrap capacitor, each sampling resistor is connected with one camera phase line of each drive bridge arm and combines one bootstrap diode and one voltage division resistor for self inspection to form one voltage division circuit for self inspection to perform self inspection of MOS tubes. The circuit structure provided by the invention performs self inspection of an open circuit and a short circuit of an MOS tube switch so as to greatly shorten the self-inspection time, avoid the damaging of the MOS tubes in a self inspection mode of detecting a large current,greatly improve the safety and greatly reduce the circuit cost.

Description

technical field [0001] The invention belongs to the field of motors, in particular to a MOS tube self-checking circuit and method for a three-phase DC brushless motor. Background technique [0002] In the driving circuit of brushless DC motor BLDCM (Brushless Direct Current Motor), MOS tube is a relatively fragile device, which often causes short circuit due to various reasons, and then damages the control board, and in severe cases, it will smoke or catch fire, or be damaged Power supply or battery pack; the production line will have defects such as tin connection during the production process. When the product is powered on, the MOS tube may be damaged, resulting in an open circuit, and the control board may run without phase. Therefore, it is necessary to Conduct open and short circuit self-test on MOS tube. [0003] The traditional MOS tube self-inspection scheme is to detect the MOS tubes one by one. In this self-inspection scheme, generally in a bridge arm of the driv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 李陆君
Owner HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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