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1.发明申请公开(公告)号：US20200280272A1
公开(公告)日：2020-09-03
申请号：US16798812
申请日：2020-02-24
Applicant: ROHM CO., LTD.
Inventor： Masanori TSUCHIHASHI , Hiroki HASHIMOTO , Mitsuo OKADA
Abstract: 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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2.发明申请公开(公告)号：US20200266739A1
公开(公告)日：2020-08-20
申请号：US16788692
申请日：2020-02-12
Applicant: ROHM CO., LTD.
Inventor： Hiroki HASHIMOTO , Masanori TSUCHIHASHI , Mitsuo OKADA , Ryota KOBAYASHI
IPC: H02P8/12
Abstract: 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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公开(公告)号：US20240291407A1
公开(公告)日：2024-08-29
申请号：US18654938
申请日：2024-05-03
Applicant: Rohm Co., Ltd.
Inventor： Hiroki HASHIMOTO , Mitsuo OKADA
CPC classification number: H02P8/32 , C02F1/4618 , C02F2001/46185 , C02F2201/4614 , C02F2201/46175
Abstract: A driver device (1) includes a pulse generation circuit (5) that generates, within one period, a pulse waveform (Spl) with a first voltage level in a first period (T1) and a pulse waveform with a second voltage level in a second period (T2). A control circuit (2) makes the first period equal to a minimum on period (Tminon) to perform a supply mode for the minimum on period and, if at the end of the minimum on period the output current (Iout) has reached the set current value (Iset), the control circuit makes a switch to a decay mode and performs a skip of a switch to the supply mode at the end of the second period.
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Patent Agency Ranking
公开(公告)号：US20220294318A1
公开(公告)日：2022-09-15
申请号：US17831803
申请日：2022-06-03
Applicant: ROHM CO., LTD.
Inventor： Hiroki HASHIMOTO , Masanori TSUCHIHASHI , Mitsuo OKADA
Abstract: 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：US20230144831A1
公开(公告)日：2023-05-11
申请号：US17913361
申请日：2021-03-18
Applicant: ROHM CO., LTD.
Inventor： Ryota MIYAGI , Hiroki HASHIMOTO
Abstract: 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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公开(公告)号：US20230129142A1
公开(公告)日：2023-04-27
申请号：US17913371
申请日：2021-03-18
Applicant: ROHM CO., LTD.
Inventor： Ryota MIYAGI , Hiroki HASHIMOTO
IPC: H02P8/12
Abstract: 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：US20200295684A1
公开(公告)日：2020-09-17
申请号：US16816842
申请日：2020-03-12
Applicant: ROHM CO., LTD.
Inventor： Hiroki HASHIMOTO
Abstract: 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：US20190149070A1
公开(公告)日：2019-05-16
申请号：US16176412
申请日：2018-10-31
Applicant: ROHM CO., LTD.
Inventor： Hiroki HASHIMOTO , Masanori TSUCHIHASHI
IPC: H02P6/15
Abstract: An error detector generates a position error value ERR that corresponds to a difference between a position instruction value P_REF indicative of a target position of a rotor based on a clock signal CLK and a position detection value P_FB indicative of the current position of the rotor based on pulse signals EN_A and EN_B received from an encoder. A feedback controller generates a torque instruction value T_REF such that a position error value ERR approaches zero. The driving IC is capable of switching modes between a rotational driving control mode and a holding mode. Control characteristics set for the feedback controller are switched according to switching between the rotational driving control mode and the holding mode.
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