National Yang Ming Chiao Tung University

Industrial Technology Research Institute

Chih-Chiang Wu

Wei-Hua Chieng

Stone Cheng

Edward Yi Chang

Shyr-Long Jeng

Ching-Yao Liu

Kuo-Bin Wang

Li-Chuan Tang

Yueh-Tsung Hsieh

Yun-Huan Li

Yi Chang

Bin-Han Lue

Hsin-Ping Chou

Newton Tang

Uma Sankar Rout

Shih-Hsiang Wu

Bang-Yuan Liu

Fu-Jen Hsu

Ching-Wei Shih

The present disclosure provides a fast charging driver. The fast charging driver is configured to charge a battery of an electronic device. The fast charging driver includes a fast charging circuit and a charging controller. The fast charging circuit includes a first depletion-type GaN transistor, a first enhancement-type field effect transistor, a second depletion-type GaN transistor and a second enhancement-type field effect transistor. The charging controller is configured to control the fast charging circuit to operate in a constant current mode or a constant voltage mode according to a battery level of the battery. By utilizing the first depletion-type GaN transistor and the second depletion-type GaN transistor with a characteristic of a relatively low switching loss, the power consumption during charging the battery by the fast charging driver is decreased to improve the charge speed.

Fast charging driver

The disclosure provides an abnormal current monitoring device and an abnormal current monitoring method. The abnormal current monitoring device includes a first detection circuit which detects a first electrical parameter of a power device based on an i-th level short circuit time, a second detection circuit which detects a second electrical parameter of the power device to generate an i-th level detection signal based on the i-th level short circuit time, and a control circuit which generates an i-th level heat estimation value to determine whether the power device is damaged according to the first electrical parameter, and determines whether the power device is abnormal in operation according to the i-th level detection signal, so as to record the i-th level heat estimation value and the i-th level short circuit time, or adjust the i-th level short circuit time to an i+1-th level short circuit time.

Abnormal current monitoring device and abnormal current monitoring method

The disclosure provides a power control device, which comprises a bleeder circuit forming a first discharging path and an aux low-voltage (LV) power supply unit forming a second discharging path. The bleeder circuit is connected with a voltage-regulating capacitor stably maintaining the high-voltage (HV) level from a HV battery. The aux LV power supply unit is connected with the bleeder circuit and the voltage-regulating capacitor in parallel. The aux LV power supply unit provides an aux LV level to the driver, when the power system operates abnormally, the HV level is discharged through the first and second discharging path and/or a third discharging path formed by a driver and a motor.

Power control device and power control method

A power module includes: a GaN transistor, an NMOS transistor, a first capacitor, a first diode and a second diode. The NMOS transistor is electrically connected to the GaN transistor. A negative electrode of the first capacitor is electrically connected to an anode of the first diode and a gate of the GaN transistor. A cathode of the second diode is electrically connected to a gate of the NMOS transistor. The power module further includes a power module control terminal electrically connected to an anode of the first capacitor and an anode of the second diode.

Power module

A control method of a minimum power input applicable to a wireless power transfer system including a power transmission unit and at least one power receiving unit is provided. The power transmission unit is electrically connected with a control voltage signal and an input voltage signal and accordingly generates the minimum power input. The power transmission unit transmits the minimum power input wirelessly through a wireless transmission to the at least one power receiving unit for receiving. By adjusting the input voltage signal, the duty ratio and resonant frequency of the control voltage signal, the present invention ensures an optimal power transmission efficiency of the wireless power transmission system. Moreover, parameters of a charge pump reservoir and gate driving circuit can be further designed in view of the trend feedback of its gate drive waveforms so as to optimize the effect of the proposed invention.

Control method of a minimum power input

A voltage-controlled varied frequency pulse width modulator is provided, including a frequency-regulating voltage output device which receives a determining voltage, decides a resonant frequency according to the determining voltage and outputs an oscillation signal having the resonant frequency. A duty-ratio-regulating voltage output device receives the oscillation signal and a reference signal to determine a duty ratio through an inverting closed loop, so as to adjust the oscillation signal to have the duty ratio. By employing the proposed voltage-controlled modulator circuit with tunable frequency and varied pulse width of the present invention, a modulation signal having the determined resonant frequency and duty ratio is obtained. Moreover, the present invention can be further combined with gate drive waveform trend feedback designs to achieve superior power transmission efficiency of a wireless power transmission system to optimize the inventive effect of the present invention.

Voltage-controlled varied frequency pulse width modulator

An operation method and an operation device of a motor driver for driving a motor are provided. The operation method includes: establishing a hysteresis control method; and adjusting a switch frequency of a power module for operating the motor by using the hysteresis control method according to a change of rotation speed of the motor and a current switch frequency.

Operation method and operation device of motor driver for driving motor

The present invention provides a communication system between electric bikes and communication method thereof. The communication system comprises a plurality of electric bikes. Each of the electric bikes comprises a monitor module and a portable electric device, wherein the portable device further comprises a storing unit and a WiFi module. The monitor module is configured to monitor the status of the electric bike to generate a plurality of monitor information. When a temporary network is formed between the electric bikes, the electric bikes transmit the monitor information each other through the temporary network and each of the electric bikes stores the received monitor information.

Growing community of inventors

Hsinchu County, Taiwan

Chih-Chiang Wu