Asustek Computer Inc.

Asus Technology Pte Ltd

Zhao-Long Dong

Ching-Ji Liang

Bing-Bing Xu

Ju-Ya Luo

Kang-Xiang Hui

Wei-Bo Hu

A power system includes a control circuit, a power conversion circuit, a current detection circuit and a overheat detection circuit. The control circuit is for generating one or more pulse signal. The power conversion circuit is electrically coupled to the control circuit, for generating an output current according to the pulse signal. The current detection circuit is electrically coupled to the power conversion circuit, for generating a sensing current according to the output current. The overheat detection circuit is electrically coupled to the current detection circuit and the control circuit, for generating the correction current according to a temperature of the power conversion circuit. The control circuit adjusts a duty ratio of the pulse signal according to a correction sensing current to adjust the output current, and the correction sensing current is a sum of the value of the sensing current and the correction current.

Power system with an overheat detection circuit

A power conversion circuit includes a voltage regulator circuit and a detection circuit. The voltage regulator circuit includes a first switch and a second switch. A first end of the first switch receives an input voltage, and a control end of the first switch receives a first drive signal. The second switch is coupled between a second end of the first switch and the ground, and is turned on or off based on a second drive signal. The first switch and the second switch regulate the input voltage to output an output voltage. The detection circuit is configured to determine whether the first switch is short-circuited or not based on a voltage level of at least one of the first end, the second end, or the control end of the first switch, and adjust the second drive signal when the first switch is short-circuited, to turn on the second switch.

Power conversion circuit

A switching power supply circuit is disclosed in an embodiment. The switching power supply circuit includes a power output stage, a pulse width modulation (PWM) signal generator, a compensation module, and a overshooting protection module. The power output stage is used for generating an output signal to drive a load device. The PWM signal generator generates a pulse width modulation (PWM) signal which is used for controlling the power output stage. The compensation module is used for generating a compensation signal to the PWM signal generator according to the output signal. The overshooting protection module receives the output signal to enable or disable the PWM signal generator.

Switching power supply circuit

A power circuit includes a control unit, a logic control circuit, a first driver amplifier, a second driver amplifier and a logic determination circuit. The control unit is used to output a pulse width modulation (PWM) signal and an enable (EN) signal. The logic control circuit receives the PWM signal and the EN signal, and outputs a first voltage signal and a second voltage signal. The first driver amplifier receives the first voltage signal, and outputs a first gate (UGATE) drive signal. The second driver amplifier receives the second voltage signal, and outputs a second gate (LGATE) drive signal. The logic determination circuit receives the PWM signal and the first and second gate drive signals. When the PWM signal and the first and second gate drive signals meet an abnormal logical relation, the logic determination circuit disables the logic control circuit.

Power circuit and circuit board, electrical device using the same

The invention discloses a short circuit protecting device adapted to a DC-DC converter with a soft-start function, and a voltage output terminal of the DC-DC converter increases an output current in segments in multiple time periods after the DC-DC converter is started. The short circuit protecting device including a voltage sensor connected to the voltage output terminal to sense the output voltage; a start timer generating a enable signal in a predetermined period after the DC-DC converter is started; a comparison circuit connected to the voltage sensor and the start timer and comparing the output voltage with a predetermined voltage according to the enable signal. The sum of the time period is a startup time of the DC-DC converter, and the startup time is longer than the predetermined period. When the output voltage is smaller than the predetermined voltage, a comparison circuit outputs a control signal to stop the DC-DC converter.

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Taipei, Taiwan

Zhao-Long Dong