Patent application number | Description | Published |
20110241641 | Current Mode Buck Converter with Fixed PWM/PFM Boundary - A current mode buck converter is disclosed. The buck converter operates in a pulse width modulation (PWM) mode or a pulse frequency modulation (PFM) mode. To prevent an output inductor with various probable magnitudes from varying a decision boundary between the PWM mode and the PFM mode, the buck converter adaptively adjusts a triggering condition for the pulse frequency modulation mode according to an average value of an inductor current of the output inductor or AC components of the inductor current and a slope compensation current. | 10-06-2011 |
20130265024 | Bootstrap Scheme for BULK-BOOST Converter - A bootstrap circuit for a voltage converter includes a bootstrap capacitor, a stable current module for generating a stable output current according to a stable output voltage, a current mirror module having a first branch circuit for generating a current signal according to the stable output current, and a charge module including a cascode transistor module including a plurality of transistors serially connected and a charge resistor for generating a conduction voltage according to the current signal, and an output circuit coupled to the current mirror module and the cascode transistor module for outputting the conduction voltage to charge the bootstrap capacitor. | 10-10-2013 |
20130285632 | Soft Start Scheme Under Low Voltage Power - A soft start circuit includes an error amplifier for generating a control signal according to an input voltage, a feedback voltage and a reference voltage, a feedback circuit for generating the feedback voltage according to an output voltage, an internal voltage source for generating a soft start voltage, and a sink circuit including a first transformation module for generating a first transformation current according to the soft start voltage, a second transformation module for generating a second transformation current according to the feedback voltage, a comparison module coupled to the first transformation module and the second transformation module for generating a comparison result according to the first transformation current and the second transformation current, and an output module coupled to the comparison module for generating a sink current according to the comparison result, so as to control the control signal. | 10-31-2013 |
20130285733 | Voltage Generator With Adjustable Slope - A charging circuit includes a first current mirror for receiving an input voltage, a second current mirror including a first branch circuit and a second branch circuit for receiving the input voltage, a switch transistor coupled to the first current mirror and the first branch circuit for determining a conduction condition of the switch transistor according to a switch signal, a first resistor including a first resistance and one end coupled to the switch transistor, and a second resistor including a second resistance and one end coupled the second branch circuit of the second current mirror, wherein the first current mirror and the second current mirror perform a charging operation of a loading circuit according to the first resistance and the second resistance. | 10-31-2013 |
20130285738 | Voltage Generator With Adjustable Slope - A charging circuit includes a first current mirror including a first branch circuit, a second branch circuit and a third branch circuit for generating a first conduction current, a second conduction current and a third conduction current according to the input voltage, a second current mirror including a fourth branch circuit coupled to the first branch circuit and including a first channel width, and a fifth branch circuit coupled to the second branch circuit and including a second channel width, wherein a load circuit is coupled between the first current mirror and the second current mirror, and the first current mirror as well as the second current mirror correspondingly adjust values of the first conduction current, the second conduction current and the third conduction current according to the first channel width as well as the second channel width, so as to process a charging operation of the load circuit. | 10-31-2013 |
20130293211 | Method and Apparatus for All Duty Current Sensing in Current Mode Converter - A current sensing apparatus for a voltage converter apparatus includes a circuit selection module for generating a circuit selection result according to a clock signal and a duty cycle signal; a current sensing module coupled to the circuit selection module, an up-bridge circuit and a down-bridge circuit of the voltage converter apparatus for measuring an up-bridge conduction current and a down-bridge conduction current according to the circuit selection result; and a current generation module coupled to the current sensing module and a slope compensation circuit of the voltage converter apparatus for generating a sensing voltage according to a slope compensation current, the up-bridge conduction current or the down-bridge conduction current, so as to adjust the duty cycle signal of the controller. The current sensing apparatus utilizes the duty cycle signal to drive the voltage converter apparatus. | 11-07-2013 |
20150028828 | VOLTAGE CONVERSION CIRCUIT AND ELECTRONIC SYSTEM USING THE SAME - A voltage conversion circuit is disclosed. The voltage conversion circuit includes an inductor, a first switch transistor, a second switch transistor, a first resistor, a second resistor and a P type transistor. When an input voltage is larger than an output voltage and a switch signal is transited to low voltage level, a control signal is a clamping voltage and the P type transistor enters into a saturation region, so that a drain voltage of the first switch transistor is a sum of the clamping voltage and a source-gate voltage of the P type transistor. When an output voltage is larger than an input voltage and a switch signal is changed to low voltage level, the control signal is the switch signal and the P type transistor enters into a linear region, so that a drain voltage of the first switch transistor is sum of the output voltage and voltage-drop of the P type transistor. | 01-29-2015 |
20150028830 | CURRENT-MODE BUCK CONVERTER AND ELECTRONIC SYSTEM USING THE SAME - A current-mode buck converter is disclosed, wherein the current-mode buck converter operates in a pulse width modulation (PWM) mode or a pulse frequency modulation (PFM) mode. When the current-mode buck converter enters into the PFM mode, the voltage level of the parking voltage is maintained at the voltage level of compensation voltage, so as to decrease switch loss of the current-mode buck converter operating between PWM mode and PFM mode, and stabilize the output voltage of the current-mode buck converter. | 01-29-2015 |