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公开(公告)号：US10826422B2
公开(公告)日：2020-11-03
申请号：US16004885
申请日：2018-06-11
申请人： ROHM CO., LTD.
发明人： Yuki Gohara
摘要： A control circuit includes: a cycle counter configured to measure a cycle of revolutions per minute (RPM) signal indicating an RPM of a motor to be driven to generate a digital measurement value; and a controller configured to generate a control command based on a digital target value corresponding to a target cycle of the RPM signal and the measurement value, wherein the controller switches between a first mode in which the control command is monotonously changed and a second mode in which the control command is generated based on proportional-integral (PI) control.
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2.发明授权Fan motor driving apparatus and method, cooling system including the same, and electronic equipment 有权风扇电机驱动装置及方法，包括冷却系统及电子设备公开(公告)号：US09490731B2
公开(公告)日：2016-11-08
申请号：US14887850
申请日：2015-10-20
申请人： ROHM CO., LTD.
发明人： Yuki Gohara , Tomofumi Mishima
CPC分类号： H02P6/12 , H02P6/001 , H02P6/008 , H02P6/085 , H02P6/15 , H02P6/165 , H02P6/17 , H02P6/26 , H02P6/34
摘要： A motor driving apparatus comprises an H bridge circuit having outputs coupled with a motor coil of a single-phase motor, a hall comparator configured to generate a hall detection signal indicating a position of a rotor of the motor, an electric angle generator configured to generate a pulse signal indicating that the motor rotates by a predetermined electric angle, a current monitoring circuit configured to asserts a zero current detection signal upon detecting a reversed direction of a coil current; a transition trigger circuit configured to assert a transition pulse when a count value of the first counter matches an lead angle set value; a logic circuit configured to transition the H bridge circuit according to a predetermined sequence of states; and a lead angle controller configured to adjust the lead angle set value based on a timing of assertion of the zero current detection signal.
摘要翻译： 一种电动机驱动装置，包括具有与单相电动机的电动机线圈耦合的输出的H桥电路，配置成产生指示电动机的转子位置的门厅检测信号的门厅比较器，配置成产生 指示电机旋转预定电角度的脉冲信号;电流监视电路，被配置为在检测到线圈电流的反向方向时断言零电流检测信号; 转换触发电路，被配置为当所述第一计数器的计数值与引导角设定值匹配时，断言转换脉冲; 逻辑电路，被配置为根据预定的状态序列来转换H桥电路; 以及引导角控制器，其被配置为基于所述零电流检测信号的断言的定时来调整所述超前角设定值。
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公开(公告)号：US09178453B2
公开(公告)日：2015-11-03
申请号：US14085216
申请日：2013-11-20
申请人： ROHM CO., LTD.
发明人： Toshiya Suzuki , Yuki Gohara
摘要： According to the voltage VU that occurs at one end of at least one of multiple coils of a fan motor, a back electromotive force detection circuit generates a detection signal BEMFU asserted in a cyclic manner when a fan motor is stably rotating. A lock protection circuit detects a lock state of the fan motor rotor. A period detection unit measures the detection signal BEMFU period. A synchronization pulse generating circuit generates a synchronization pulse having a period that is 1/N (N represents an integer of 2 or more) of that of the detection signal BEMFU measured in a previous cycle. A lock judgment unit counts the synchronization pulse in increments of cycles of the detection signal BEMFU. When the count value exceeds a predetermined threshold value M (M represents an integer of 2 or more) which is greater than N, the lock mode judgment signal is asserted.
摘要翻译： 根据在风扇电动机的多个线圈的至少一个线圈的一端发生的电压VU，当电动机稳定地旋转时，反电动势检测电路产生以循环方式断言的检测信号BEMFU。 锁定保护电路检测风扇电动机转子的锁定状态。 周期检测单元测量检测信号BEMFU周期。 同步脉冲发生电路产生具有在前一周期测量的检测信号BEMFU的周期为1 / N（N表示2以上的整数）的周期的同步脉冲。 锁定判断单元以检测信号BEMFU的周期为增量对同步脉冲进行计数。 当计数值超过大于N的预定阈值M（M表示2以上的整数）时，锁定模式判断信号被断言。
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公开(公告)号：US10234914B2
公开(公告)日：2019-03-19
申请号：US14703324
申请日：2015-05-04
申请人： ROHM CO., LTD.
发明人： Yuki Gohara , Tomofumi Mishima
摘要： A driving circuit of an electric motor includes: a PWM input pin for externally receiving an input pulse modulation signal with an input duty cycle; a duty cycle to digital converter for receiving and converting the input pulse modulation signal into a first digital value; a slope setting pin for receiving information indicative of a slope of an output duty cycle corresponding to the input duty cycle; a slope acquisition unit for acquiring a second digital value corresponding to the information indicative of the slope; a duty cycle computation unit for generating a linearly increased duty cycle instruction value corresponding to the first digital value by referring to the slope; a digital pulse width modulator for generating a controlling pulse having the output duty cycle corresponding to the duty cycle instruction value; and an output circuit for driving the electric fan motor in accordance with the controlling pulse.
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公开(公告)号：US09800185B2
公开(公告)日：2017-10-24
申请号：US14793136
申请日：2015-07-07
申请人： ROHM CO., LTD.
发明人： Yuki Gohara , Tomofumi Mishima
IPC分类号： H02P7/29 , H02P6/12 , H02H7/085 , H02P29/024
CPC分类号： H02P7/29 , H02H7/085 , H02H7/0851 , H02P6/12 , H02P29/0241
摘要： A circuit for driving a fan motor includes: a control input interface circuit configured to generate a first digital value indicating an input duty ratio; a duty calculation unit configured to generate a duty command value linearly increasing with a slope with respect to the first digital value; a digital pulse width modulator configured to generate a control pulse having an output duty ratio corresponding to the duty command value; an output circuit configured to drive a fan motor based on the control pulse; a lock protection circuit configured to switch between an enable state and a disable state and to stop supply of power to the fan motor when lock of the fan motor is detected in the enable state; and a torque-off determination unit configured to switch the lock protection circuit to the disable state in a torque-off state.
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公开(公告)号：US10003288B2
公开(公告)日：2018-06-19
申请号：US15422701
申请日：2017-02-02
申请人： ROHM CO., LTD.
发明人： Hikaru Sasaki , Kenji Asai , Yuki Gohara , Masateru Moroizumi
摘要： A control circuit for a motor, includes: a plurality of m number of analog ports to each of which a detection signal indicating an electrical state of the motor is input, m being an integer of 2 or more; an A/D converter including a multiplexer to receive detection signals of the m number of analog ports and being configured to convert a detection signal selected by the multiplexer into digital data; a processor to generate a drive command of the motor based on the digital data; a pulse width modulator to perform pulse width modulation to generate a PWM signal based on the drive command; and an interface circuit to be triggered by at least one internal signal generated in the control circuit to control an operation of the A/D converter according to a control command from the processor and deliver the digital data to the processor.
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7.发明授权公开(公告)号：US09712089B2
公开(公告)日：2017-07-18
申请号：US14882932
申请日：2015-10-14
申请人： ROHM CO., LTD.
发明人： Yuki Gohara , Tomofumi Mishima
摘要： The present invention inhibits the voltage jump of a source voltage or an output voltage by an approach which is different from a conventional one. A logic circuit allows an H bridge circuit to be shifted among a plurality of states in a specific sequence. A compulsory regenerating circuit is configured to be switched between an enabled state and a disabled state; while being in the enabled state, the current that flows in from a ground line via the H bridge circuit and a motor coil to a power line back-flows to the ground line.
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