Rohm Co., Ltd.

Tetsuo Yamato

Noboru Takizawa

Shuntaro Takahashi

Takashi Fujimura

Kazuki Okuyama

Takashi Fujimara

The present disclosure provides a semiconductor device. The semiconductor device includes: a first terminal; a second terminal; and at least one first switch element and at least one second switch element, configured to be connected between the first terminal and the second terminal; an overcurrent detection circuit, configured to detect an overcurrent flowing through the first terminal; and an off circuit, configured to turn off at least a portion of the at least one second switch element when the semiconductor device is started.

Semiconductor device, electronic apparatus and vehicle

Disclosed is a switch device including a first terminal, a second terminal, a third terminal, a switch element disposed between the first terminal and the second terminal, a control line that reaches a control end of the switch element from the third terminal, a first circuit block that is disposed on the control line and is configured to drive the switch element according to a control signal supplied to the third terminal, at least one second circuit block, each second circuit block being connected to a corresponding one of branch power supply lines that branch from the control line, a first resistor disposed between the third terminal and the first circuit block, and at least one second resistor, each second resistor being disposed on a corresponding one of the branch power supply lines.

Switch device, electronic equipment, and vehicle

A switch device includes an output transistor, an overcurrent protection circuit configured to be capable of performing an overcurrent protection operation in which magnitude of target current flowing in the output transistor is limited to a predetermined upper limit current value or less, and a control circuit configured to be capable of controlling a state of the output transistor and capable of changing the upper limit current value among a plurality of current values including a predetermined first current value and a predetermined second current value less than the first current value. The control circuit can limit the magnitude of the target current to the first current value or less in response to the magnitude of the target current reaching the first current value, and then change the upper limit current value to the second current value.

Switch device

The present invention provides a motor driver and a motor driving system capable of suppressing power consumption when a motor is in a brake state. The motor driver of the present invention includes: a half-bridge power output section, including a high-side transistor and a low-side transistor; a high-side driving circuit, driving the high-side transistor; and a control portion. When switching to a brake mode, the low-side transistor is turned on and the control portion turns off the high-side driving circuit.

Motor driver and motor driving system

The present disclosure relates to a driver device, which can drive a load in high temperatures. In a driver IC which drives a motor by switch-driving four output transistors, a gate driving circuit is configured to render a slew rate of a gate voltage of each output transistor to be adjustable at multiple steps while the output transistor is switching. Although a predetermined rate is set to be the slew rate of the gate voltage in a normal state, the slew rate is increased at high temperatures.

Driver device

A motor driving device includes an abnormality detecting portion arranged to detect an abnormality of one of a plurality of position detection signals based on outputs from a plurality of Hall sensors arranged to detect a rotor position of a brushless DC motor, a measuring portion arranged to measure time between neighboring edges of a normal position detection signal when the abnormality detecting portion detects an abnormality, and a drive control portion arranged to control a drive signal for driving the brushless DC motor based on a latest time measurement result of the measuring portion.

Motor driving device

A motor driving device includes a logic unit configured to control an electrical conduction of a motor, a reference clock signal generating unit configured to generate a reference clock signal based on a rotational speed indication signal, a rotational speed signal generating unit configured to generate a rotational speed signal based on a rotational speed of the motor, and a rotational speed feedback control unit configured to receive the reference clock signal and the rotational speed signal and control the logic unit so that the rotational speed of the motor reaches a target value. The rotational speed feedback control unit changes a feedback gain in response to the rotational speed signal.

A motor drive apparatus comprises: a position signal generation portion that generates a position signal corresponding to a rotor position of a brushless DC motor; and a logic portion that when starting the brushless DC motor, disposes a non-energizing period immediately after starting forced commutation at a phase switchover timing corresponding to a predetermined forced commutation frequency and performs energizing control of the brushless DC motor such that usual commutation is started at a phase switchover timing corresponding to the position signal that is generated during an inertial rotation of the rotor.

Motor drive apparatus

A motor driving apparatus includes an automatic gain control circuit on a signal path for transmitting a rotor-position detecting signal (hall voltage signal), and the automatic gain control circuit includes: an amplifier, configured to perform differential amplification on an input signal (step-angle hall current signal) to generate an output signal (amplified hall current signal); and a feedback control portion, configured to monitor the output signal (monitored current signal) to decide a gain of the amplifier.

Motor driving apparatus and motor apparatus using the same

A motor driver includes a control portion, for performing variable control on a torque or rotation speed of a motor through a control signal; and an output mode selection circuit, for sending an indication to the control portion when the control signal is abnormal, so that the motor enters an action status corresponding to a selection signal.

Growing community of inventors

Kyoto, Japan

Tetsuo Yamato