Motor control circuit and brushless direct current 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, Improve reliability and safety, reduce the effect of after-sale defective rate
Active Publication Date: 2020-10-30
GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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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
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[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0021] It should be noted that the terms "first" and "second" in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under ap...
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The invention discloses a motor control circuit and a brushless direct current motor. The circuit comprises a controller MCU used for outputting a control signal to a driving chip; a driving chip which at least comprises a signal receiving end and a first circuit, wherein the first circuit is connected with a second circuit at an external output end, a target resistor is arranged between the firstcircuit and the second circuit, the target resistor is used for suppressing negative voltage of the first circuit when the power switching device is turned off, and the signal receiving end is used for receiving the control signal; and a power switching device which is used for completing conduction operation or turn-off operation based on the control signal. According to the invention, the technical problem that when the source electrode of the power switch device is connected with the negative voltage, if the negative voltage value exceeds the absolute maximum rated value, the driving circuit and the power switch device are easily damaged and the motor fails in the prior art is solved.
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 brushless DC motors due to its simple technology and low cost. But this kind of circuit has big flaws: First, the duty cycle is limited by the time required for the bootstrap capacitor to refresh the charge; second, when the source of the power switching device is connected to a negative voltage, once the negative voltage exceeds the specified absolute maximum rating If the gate drive integrated circuit is damaged, or the gate drive integrated circuit is temporarily latched, the high-side and low-side switches in the half-bridge cir...
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Login to View More 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 OF ZHUHAI