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公开(公告)号：US10193478B2
公开(公告)日：2019-01-29
申请号：US15133584
申请日：2016-04-20
申请人： Rohm Co., Ltd.
发明人： Hiroki Hashimoto , Ryoichi Inoue
摘要： A motor driving device and driving method of the same used to surely suppress the influence of counter electromotive force is provided. The motor driving device 100 includes an auto-decay portion 141. The auto-decay portion 141 controls a path of a electric current flow in a motor coil when supplying the electric current and when decaying the electric current. The influence of counter electromotive force generated in a stepping motor 200 can be suppressed by the auto-decay portion 141 configured to control so that a ratio or an decay time of a slow decay mode and a fast decay mode of previous cycle is different from a ratio or an decay time of the slow decay mode and the fast decay mode of current cycle.
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公开(公告)号：US12132434B2
公开(公告)日：2024-10-29
申请号：US17913371
申请日：2021-03-18
申请人： ROHM CO., LTD.
发明人： Ryota Miyagi , Hiroki Hashimoto
IPC分类号： H02P8/12
CPC分类号： H02P8/12
摘要： A driver device includes a control circuit for controlling an output stage circuit for supplying an output current to a coil, and makes a movable part move with the magnetism generated by the supplied output current. The control circuit can perform holding control to hold the state of the movable part unchanged by suspending its movement. During the holding control by the control circuit, application of an external force tending to change the state of the movable part against the holding control is detected based on the state of supply of electric power to the coil by the output stage circuit, the output current, or the current flowing through the output stage circuit.
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公开(公告)号：US11264926B2
公开(公告)日：2022-03-01
申请号：US16816842
申请日：2020-03-12
申请人： ROHM CO., LTD.
发明人： Hiroki Hashimoto
摘要： Excitation position is changed in accordance with an external clock. The state of a full bridge circuit including four transistors connected to a coil of a stepping motor, is controlled in accordance with the excitation position. At the time of transition from the excitation position at which coil current that flows in the coil is nonzero to the excitation position at which the coil current is zero, a switch is made to (i) the inverse state where the on or off state of each of the four transistors before the transition is inverted, and then a switch is made to (ii) the off state where all the four transistors are off.
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公开(公告)号：US20160315571A1
公开(公告)日：2016-10-27
申请号：US15133584
申请日：2016-04-20
申请人： Rohm Co., Ltd.
发明人： Hiroki Hashimoto , Ryoichi Inoue
IPC分类号： H02P8/18
CPC分类号： H02P8/18
摘要： A motor driving device and driving method of the same used to surely suppress the influence of counter electromotive force is provided. The motor driving device 100 includes an auto-decay portion 141. The auto-decay portion 141 controls a path of a electric current flow in a motor coil when supplying the electric current and when decaying the electric current. The influence of counter electromotive force generated in a stepping motor 200 can be suppressesed by the auto-decay portion 141 configured to control so that a ratio or an decay time of a slow decay mode and a fast decay mode of previous cycle is different from a ratio or an decay time of the slow decay mode and the fast decay mode of current cycle.
摘要翻译： 提供了一种用于可靠地抑制反电动势的影响的电动机驱动装置及其驱动方法。 电动机驱动装置100包括自动衰减部141.自动衰减部141在供给电流时以及衰减电流时，控制电动机线圈中的电流的路径。 在步进电机200中产生的反电动势的影响可以被配置为控制的自动衰减部分141抑制，使得前一周期的慢衰减模式和快速衰减模式的比率或衰减时间不同于 比例或慢衰减模式的衰减时间和当前周期的快速衰减模式。
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公开(公告)号：US12003204B2
公开(公告)日：2024-06-04
申请号：US17913361
申请日：2021-03-18
申请人： ROHM CO., LTD.
发明人： Ryota Miyagi , Hiroki Hashimoto
摘要： A driver device supplies an output current to each coil in a stepping motor to rotate a rotor. After the polarity and magnitude of the output current for each coil have reached the target polarity and magnitude, during control for keeping the polarity and magnitude of the output current for each coil at the target polarity and magnitude, occurrence of a particular current waveform in the output current due to a back-electromotive force resulting from the rotation of the rotor is detected so that, if a particular current waveform is detected, a predetermined detection signal is transmitted to an external device.
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6.发明授权公开(公告)号：US11418138B2
公开(公告)日：2022-08-16
申请号：US16798812
申请日：2020-02-24
申请人： ROHM CO., LTD.
摘要： The task of the present invention is to provide a driving circuit capable of outputting information useful to design or control of a system to outside. The present invention relates to a driving circuit and a driving method of a stepping motor, and an electronic machine using the driving circuit of a stepping motor. A counter electromotive force detection circuit detects a counter EMF generated in a coil. A revolution count detection circuit acquires the revolution count of the stepping motor. A load angle estimating portion calculates a load angle according to the counter EMF and the revolution count. An interface circuit is configured to be capable of outputting angle information associated with the load angle to outside, or accessing the angle information from the outside.
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公开(公告)号：US12088155B2
公开(公告)日：2024-09-10
申请号：US17831803
申请日：2022-06-03
申请人： ROHM CO., LTD.
摘要： A driving circuit drives a stepping motor in synchronization with an input clock using a 2-phase excitation method. A constant current chopper circuit generates a pulse modulation signal such that the detection value of the coil current approaches a current setting value. A detection window generation circuit generates a detection window. The detection window becomes an open state at a timing at which the coil current IOUT becomes smaller than a predetermined threshold value. A logic circuit sets a full-bridge circuit to a high-impedance state when the detection window is in the open state and controls the full-bridge circuit according to the pulse modulation signal when the detection window is in the closed state. In the open state of the detection window, a back electromotive force (BEMF) detection circuit detects the BEMF of the coil. A current value setting circuit controls a current setting value based on the BEMF.
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公开(公告)号：US11381184B2
公开(公告)日：2022-07-05
申请号：US16788692
申请日：2020-02-12
申请人： ROHM CO., LTD.
IPC分类号： H02P8/12
摘要： There is provided a driving circuit for a stepping motor, including: a counter electromotive force detection circuit configured to detect a counter electromotive force generated in a coil; a current value setting circuit configured to generate a current set value based on the counter electromotive force; a constant current chopper circuit configured to generate a pulse-modulated signal which is pulse-modulated so that a detected value of a coil current flowing through the coil approaches a target amount based on the current set value; and a logic circuit configured to control a bridge circuit connected to the coil according to the pulse-modulated signal, wherein the driving circuit is configured to output the current set value to outside or to access the current set value from the outside.
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