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Motor control circuit and brushless DC motor

A motor control and circuit technology, applied in motor control, electronic commutation motor control, single motor speed/torque control, etc., can solve problems such as motor failure, drive circuit and power switching device damage, and avoid motor failure, The effect of improving reliability and safety and reducing after-sales defect rate

Active Publication Date: 2022-04-05
GREE ELECTRIC APPLIANCES INC
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  • Description
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AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a motor control circuit and a brushless DC motor, so as to at least solve the problem in the related art that when the source of the power switching device is connected to a negative voltage, if the negative voltage value exceeds the absolute maximum rating, it is easy to cause the drive circuit and power switching devices are damaged, resulting in technical problems of motor failure

Method used

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  • Motor control circuit and brushless DC motor

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Embodiment Construction

[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses a motor control circuit and a brushless direct current motor. Wherein, the circuit includes: a controller MCU for outputting control signals to the driver chip; the driver chip at least includes: a signal receiving end and a first circuit for outputting the control signal to the gate of the power switching device, wherein the first A circuit is connected to the second circuit of the external output terminal, and a target resistance is set between the first circuit and the second circuit. The target resistance is used to suppress negative voltage in the first circuit when the power switching device is turned off, and the signal receiving end is used for The control signal is received; the power switching device completes a turn-on operation or a turn-off operation based on the control signal. The invention solves the technical problem in the related art that when the source of the power switching device is connected to a negative voltage, if the negative voltage value exceeds the absolute maximum rating, the driving circuit and the power switching device are easily damaged and the motor fails.

Description

technical field [0001] The invention relates to the technical field of motor circuit design, in particular to a motor control circuit and a brushless DC motor. Background technique [0002] In related technologies, with the widespread application of brushless DC motors, circuits including power switch tubes and IGBTs (Insulated Gate Bipolar Transistors) are widely designed. Among them, the bootstrap gate drive circuit is widely used in the control of the brushless DC motor due to the advantages of simple technology and low cost. But there are big defects in this circuit: first, the duty cycle is limited by the time required to refresh the charge of the bootstrap capacitor; second, when the source of the power switching device is connected to a negative voltage, once the negative voltage value exceeds the specified absolute maximum rating value, the gate drive integrated circuit is damaged, or the gate drive integrated circuit is temporarily latched, which may cause the high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H03K17/08H02P29/032
CPCH02P6/085H03K17/08H02P29/032
Inventor 张晓菲王颜章李季李湘肖胜宇吴文贤
Owner GREE ELECTRIC APPLIANCES INC
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