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公开(公告)号：US11770092B2
公开(公告)日：2023-09-26
申请号：US17879004
申请日：2022-08-02
申请人： ROHM CO., LTD.
发明人： Yuji Saegusa , Joji Noie
IPC分类号： H02P29/024 , F04D25/06
CPC分类号： H02P29/0241 , F04D25/06
摘要： A bridge circuit includes a high-side transistor connected between a power supply terminal and an output terminal, and a low-side transistor connected between the output terminal and a ground terminal. A high-side pre-driver and a low-side pre-driver drive the high-side transistor and the low-side transistor. A first transistor is connected between the output terminal and the ground terminal in a manner to form the regenerative path parallel to the low-side transistor. In a regenerative state in which a current sinks from the output terminal, a regenerative control circuit controls the voltage of a control terminal of the first transistor in a manner that an output voltage of the output terminal approaches a target voltage higher than the power supply voltage of the power supply terminal by a first voltage width.
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公开(公告)号：US09954476B2
公开(公告)日：2018-04-24
申请号：US15166416
申请日：2016-05-27
申请人： ROHM CO., LTD.
发明人： Tomofumi Mishima , Masahiro Nakamura , Joji Noie
摘要： A TH terminal receives an analog control voltage VTH which indicates a rotational speed. With a first platform, a capacitor and a discharging resistor are connected in parallel between an OSC terminal and the ground. A charging resistor and a first switch are arranged in series between the OSC terminal and a reference voltage line via which a stabilized voltage is supplied. When an oscillator voltage VOSC that occurs at the OSC terminal reaches an upper-side threshold VH, a switching circuit turns off the first switch. When the oscillator voltage VOSC falls to a lower-side threshold value VL, the switching circuit turns on the first switch. The oscillator voltage VOSC is compared with the voltage at the TH terminal, so as to generate a pulse-modulated control pulse S3.
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