High voltage brushless DC motor driver
A brush DC motor and driver technology, applied in the direction of single motor speed/torque control, etc., can solve the problems of complex driver circuit structure, unfavorable miniaturization, high cost, etc., achieve miniaturization, reduce occupied space, and save production costs Effect
Inactive Publication Date: 2015-12-09
苏州航天林泉电机有限公司
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Problems solved by technology
However, the overall circuit structure of this type of driver is complex, the cost is high, and it is not conducive to miniaturization
Method used
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[0018] figure 1 is a functional block diagram of a high-voltage brushless DC motor driver according to an embodiment of the present invention. Generally speaking, the high-voltage brushless DC motor driver described in this embodiment includes: a commutation switch signal generation circuit, an inverter, an optocoupler circuit and a drive circuit, wherein the commutation switch signal generation circuit generates a switch signal, and then After being buffered by the inverter, it is sent to the optocoupler circuit. The optocoupler circuit realizes the isolation between the drive circuit and the commutation switch signal generation circuit, and the drive circuit finally performs signal transmission according to the drive signal transmitted from the optocoupler circuit. The power and voltage are amplified to drive the DC motor.
[0019] Specifically, if figure 1 As shown, the high-voltage brushless DC motor driver should include:
[0020] Phase commutation switch signa...
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The present invention discloses a high voltage brushless DC motor driver. The high voltage brushless DC motor driver is characterized in that a phase-change switch signal generating circuit generates three phases and six switch signals, then a phase inverter is connected with each phase of the phase-change switch signal generating circuit, and then the optocoupler circuits are connected with the phase inverters used for buffer respectively and are used to isolate the phase-change switch signal generating circuit and the drive circuits. Finally the drive circuits receive the switch signals transmitted back from the optocoupler circuits to generate the driving signals of which the powers and the voltages are amplified. According to the present invention, the isolation points are selected at the input ends of the drive circuits without needing a conventional isolative power supply module, and the devices, such as the optocoupler circuits, the driving chips, etc., are reduced by 50% by being compared with the prior art, the production cost is saved, at the same time, the occupied space of the internal circuits of the driver is reduced, thereby realizing the miniaturization of the driver.
Description
technical field [0001] The invention relates to the technical field of motor drive, in particular to a high-voltage brushless DC motor driver. Background technique [0002] For a brushless DC motor with a voltage level of 550V, its drive circuit is extremely susceptible to interference from the power bus voltage. This kind of interference can cause the commutation logic circuit in the drive to fail to work normally, or burn the drive if it is severe. Moreover, the unisolated strong electricity is very unsafe, and it is easy to cause electric shock accidents for operators. [0003] In order to solve the above problems, it is necessary to isolate the strong current and the weak current. The usual isolation methods include optocoupler isolation and transformer isolation. Taking optocoupler isolation as an example, in this kind of drive circuit, the isolation point is selected on the drive chip that provides the switching signal of the power tube, so the optocoupler drive chip...
Claims
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IPC IPC(8): H02P6/08
Inventor 杜克峰朱燕青邹毅
Owner 苏州航天林泉电机有限公司