Motor drive circuit and motor drive method
A technology of motor drive circuit and drive current, which is applied in the direction of excitation or armature current control, and can solve problems such as poor precision and poor voltage utilization efficiency
Inactive Publication Date: 2014-09-24
ROHM CO LTD
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Problems solved by technology
In the past, the method of rotating the motor by detecting the counter electromotive force (such as a tape, etc.) has been used in the bridge control method, but because of the poor voltage utilization efficiency, the resistance value of the motor coil varies with temperature, and the accuracy is poor, it is generally used. Hall sensor, speed sensor method
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[0030] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and signals shown in the drawings are given the same reference numerals, and redundant descriptions are appropriately omitted. In addition, in each drawing, illustration of some components that are not important for describing the embodiment of the present invention is omitted.
[0031] In this specification, the so-called "state where component A is connected to component B" includes the situation where component A and component B are physically directly connected, as well as the situation where component A and component B are indirectly connected via other components that do not affect the electrical connection state. situation.
[0032] An embodiment of the present invention is a motor drive circuit that drives a DC motor, for example, can be suitably applied to a drive circuit for a DC motor that moves a len...
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The invention provides a motor drive circuit and a motor drive method for detecting a back electromotive force voltage. The motor drive circuit (100) comprises an H bridge circuit (10), a potential difference detection circuit (20), a correction circuit (30), a back electromotive force detection circuit (40), a control circuit (50) and a correction value acquiring circuit (60). The H bridge circuit is connected to a DC motor (1). The potential difference detection circuit outputs a voltage across with respect to the potential difference on two ends of the DC motor. The correction circuit outputs the correction voltage with respect to a resistance component. The back electromotive force detection circuit considers the voltage with respect to the difference between the voltage across and the correction voltage as the detection voltage representing the back electromotive force voltage to output. The control circuit drives the H bridge circuit through pulse width modulation. The correction circuit corrects the voltage drop generated by an on resistance of a downside transistor by means of a correction value with respect to a ratio of on resistances of the resistance component and the downside transistor; and the voltage is a corrective voltage with respect to the resistance component.
Description
technical field [0001] The invention relates to motor drive technology, in particular to the control technology of motor speed. Background technique [0002] It is known that when a motor such as a DC motor or a spindle motor is rotated, a back electromotive voltage corresponding to the rotational speed is generated in the motor (for example, refer to Patent Document 1). In the past, the method of rotating the motor by detecting the counter electromotive force (such as a tape, etc.) has been used in the bridge control method, but because of the poor voltage utilization efficiency, the resistance value of the motor coil varies with temperature, and the accuracy is poor, it is generally used. Hall sensor, speed sensor way. However, if high precision is not required, the method of using the back EMF voltage is still very valuable. [0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2000-166285 Contents of the invention [0004] [Problem to be solved by ...
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IPC IPC(8): H02P7/29
Inventor 清水立郎
Owner ROHM CO LTD