Upi Semiconductor Corporation

Wei-Hsiu Hung

Chih-Lien Chang

Yen-Chih Lin

Min-Rui Lai

Chen-Xiu Lin

Wei-Hsiang Wang

Yun-Kuo Lee

Chun-Ming Lu

A controller of a power conversion circuit generates PWM signals to control output stage circuits to provide an output voltage and a load current to an output terminal. The controller includes a sensing circuit, a comparison circuit, a PWM generation circuit and a control loop. The sensing circuit generates a current sensing signal related to load current. The comparison circuit compares the current sensing signal and a default value representing a current threshold to generate a comparison result. The control loop, coupled to the output terminal, the PWM generation circuit and the comparison circuit, generates a trigger signal according to a reference voltage and the output voltage to control the PWM generation circuit to generate PWM signals. When the comparison result indicates that the load current exceeds current threshold, the control loop temporarily stops providing trigger signal to PWM generation circuit to delay the generation of PWM signals.

Controller of power conversion circuit and operating method thereof

A controller of a power conversion circuit, coupled to a smart power stage (SPS), controls SPS to convert an input voltage into an output voltage and provides an output current. The SPS provides a current monitoring signal to the controller. The controller includes a control loop, a sampling circuit and a current reconstruction circuit. The control loop is coupled to SPS and generates a pulse-width modulation (PWM) signal to control the operation of SPS. The sampling circuit is coupled to SPS and receives the current monitoring signal. The current monitoring signal is sampled according to PWM signal to obtain a calibration reference value. The current reconstruction circuit is coupled to the control loop and sampling circuit and generates a reconstructed current corresponding to actual output current. The reconstructed current is produced according to an input voltage, a reference voltage and PWM signal and calibrated using the calibration reference value.

A control circuit of a power converter and a control method thereof are provided. The control circuit includes an error amplifier, a controller, a digital filter, and a digital pulse width signal modulator. The error amplifying circuit is coupled to an output terminal of the power converter and provides a digital error signal. The controller provides a first working parameter corresponding to the first external control command when receiving a first external control command. The digital filter generates a current digital compensation value. The digital pulse width signal modulator generates a pulse width modulation signal. The controller provides a second working parameter corresponding to the second external control command when receiving a second external control command. The controller calculates a transition value according to the second working parameter and the current digital compensation value. The controller provides the second working parameter and the transition value to the digital filter.

Control circuit of power converter and control method thereof

A control circuit of a power converter includes a first sensing circuit, a reference voltage generation circuit, an error amplifying circuit and a PWM circuit. The first sensing circuit, coupled to a first output circuit, provides a first current sensing signal. The reference voltage generation circuit, coupled to the first sensing circuit, provides a reference voltage according to the first current sensing signal. The error amplifying circuit, coupled to the reference voltage generation circuit, receives the reference voltage and an output feedback voltage of the power converter to provide an error amplifying signal. The PWM circuit, coupled between the error amplifying circuit and the first output circuit, receives the error amplifying signal and provides a control signal to control the first output circuit. The reference voltage generation circuit further receives the error amplifying signal and adjusts the reference voltage it generates according to the error amplifying signal.

Control circuit of power converter and reference voltage adjusting method thereof

A control circuit of a power converter includes a sensing circuit, a ramp signal generator, an error amplifier, a comparator and a PWM circuit. The sensing circuit, coupled to a first output circuit, provides a current sensing signal. The ramp signal generator, coupled to the sensing circuit, receives the current sensing signal to provide a ramp signal. The error amplifier receives a reference voltage and an output feedback voltage of the power converter to provide an error amplification signal. The comparator, coupled to the ramp signal generator and the error amplifier, provides a control signal according to the ramp signal and the error amplification signal. The PWM circuit, coupled between the comparator and the first output circuit, receives the control signal and provides a PWM signal to control the first output circuit. The ramp signal generator adjusts a slope of the ramp signal according to the current sensing signal.

Control circuit of power converter

A control circuit of a power converter includes a sensing circuit, a ramp signal generation circuit and a PWM circuit. The sensing circuit, coupled to an output circuit, provides a current sensing signal. The ramp signal generation circuit includes a transient circuit and a signal generation circuit. The transient circuit receives the current sensing signal and generates a variable reference voltage. The signal generation circuit provides a ramp signal according to the variable reference voltage. The PWM circuit provides a PWM signal to the output circuit according to the ramp signal. When current sourcing occurs, it continues for a first default time. A transient state during current sourcing continues for a second default time less than first default time. The variable reference voltage is changed from a default value to an adjusted value during the second default time and restored to the default value after the second default time.

A power conversion circuit includes an error amplifying circuit, a first comparison circuit, a second comparison circuit and a control circuit. The error amplifying circuit provides an output signal. The first comparison circuit, coupled to the error amplifying circuit, receives the output signal and a ramp signal to generate a first comparison signal. The second comparison circuit receives an output voltage and a first reference voltage and provides a second comparison signal. The control circuit, coupled to the error amplifying circuit, the first comparison circuit and the second comparison circuit, provides a control signal to control the error amplifying circuit according to the first comparison signal, the second comparison signal and an enabling signal. In a first operation mode of error amplifying circuit, the output signal is an error amplifying signal. In a second operation mode of error amplifying circuit, the output signal is a second reference voltage.

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Zhubei, Taiwan

Wei-Hsiu Hung