Abstract: A method for controlling a power switch of a power converter includes: detecting whether a zero current event occurs; generating an error signal; generating an ramp signal having a slope proportional to a ratio of an on time during which of the power switch is turned on in a previous switching cycle to a time length of the previous switching cycle; comparing the ramp signal with the error signal; turning on the power switch when the zero current event occurs; and turning off the power switch and rapidly lowering the level of the ramp signal when the ramp signal is greater than or equal to the error signal.

Abstract: A control chip of a driving circuit for driving a LED array shares a ground terminal with the LED array so that, without an additional winding, the driving circuit can provide a supply voltage for the control chip, implement a zero-current switching function, and implement an over-voltage protection function. Since no additional windings are needed, the related costs and the size of the driving circuit are decreased.

Abstract: The present invention provides a multi-load control apparatus, a slave circuit and a control method thereof. The multi-load control apparatus includes a master circuit and at least one slave circuit. The master circuit generates at least one pulse width modulation (PWM) signal according to an input signal. The slave circuit controls a power switch according to a corresponding PWM signal. The slave circuit has a primary side circuit and a secondary side circuit. The primary side circuit generates an AC PWM signal according to the corresponding PWM signal. The power switch has a control terminal which is driven according to a floating ground level which is not a constant voltage level. The power switch has a current inflow terminal and a current outflow terminal, which are connected to a corresponding load circuit in series, wherein the series circuit of the power switch and the load circuit receives an AC voltage.

Abstract: A method for controlling a power switch of a power converter includes: detecting whether a zero current event occurs; generating an error signal; generating an adjusted voltage by multiplying a setting voltage by a ratio of an on time during which of the power switch is turned on in a previous switching cycle to a time length of the previous switching cycle; performing a low-pass filtering operation on the adjusted voltage to generate a filtered signal; providing a transconductance amplifier for converting the filtered signal into a ramp signal; turning on the power switch when the zero current event occurs; and turning off the power switch and rapidly lowering the level of the ramp signal when the ramp signal is greater than or equal to the error signal.

Abstract: An AC-to-DC power converter includes a rectifier for generating a rectified voltage based on an AC voltage; an input capacitor coupled between the rectifier and a fixed-voltage terminal; a first inductive element; a first auxiliary capacitor; a first switch coupled between the input capacitor and the first inductive element; a second switch coupled between the first inductive element and the fixed-voltage terminal; a circuitry node; an auxiliary switch for coupling between the circuitry node and the first auxiliary capacitor or between the first auxiliary capacitor and the fixed-voltage terminal; a first diode; a second diode; a control signal generating circuit for controlling the first switch and the second switch; and an auxiliary switch control circuit for controlling the auxiliary switch.

Abstract: A control chip of a driving circuit for driving a LED array shares a ground terminal with the LED array so that, without an additional winding, the driving circuit can provide a supply voltage for the control chip, implement a zero-current switching function, and implement an over-voltage protection function. Since no additional windings are needed, the related costs and the size of the driving circuit are decreased.

Abstract: A flip-flop circuit includes a first latch, a second latch and a trigger circuit. The first latch is configured to set a first output signal based on a first input signal and a clock signal. The second latch is configured to set a second output signal based on a second input signal and the clock signal. The trigger circuit is coupled with the first latch and the second latch. The trigger circuit is configured to generate the second input signal based on at least the second output signal. The trigger circuit is configured to cause the second input signal to have different voltage swings based on the first output signal and the second output signal. The trigger circuit includes a logic circuit coupled to at least the first latch or the second latch. The logic circuit is configured to output the second output signal.

Abstract: A power factor correction (PFC) circuit of a power converter is disclosed. The power converter includes a primary side coil, a secondary side coil, an inductive coil, and a power switch. The PFC circuit includes a zero current detection circuit for detecting an inductive signal of the inductive coil to generate a detection signal; an error detection circuit for generating an error signal corresponding to an output voltage signal or an output current signal according to a reference signal; a ramp signal generating circuit for generating a ramp signal; a comparison circuit for comparing the ramp signal with the error signal to generate a comparison signal; and a trigger circuit for generating a control signal to control the power switch and for controlling the ramp signal generating circuit to adjust a slope of the ramp signal according to the detection signal and the comparison signal.

Abstract: A control chip of a driving circuit for driving a LED array shares a ground terminal with the LED array so that, without an additional winding, the driving circuit can provide a supply voltage for the control chip, implement a zero-current switching function, and implement an over-voltage protection function. Since no additional windings are needed, the related costs and the size of the driving circuit are decreased.

Abstract: A flip-flop circuit includes a first latch, a second latch, and a trigger stage. The first latch is configured to set a first latch output signal based on a first latch input signal and a clock signal. The second latch is configured to set a second latch output signal based on a second latch input signal and the clock signal. The trigger stage is configured to generate the second latch input signal based on the first latch output signal. The trigger stage is configured to cause the second input signal to have different voltage swings based on the first latch output signal and the second latch output signal.

Abstract: The present invention provides a flyback power converter, a secondary side control circuit, and a control method thereof. The flyback power converter converts an input voltage to an output voltage, and provides a load current to a load circuit. The flyback power converter includes: a transformer circuit, a power switch circuit, a switch current sense circuit, a primary side control circuit, and a secondary side control circuit. The secondary side control circuit adaptively adjusts a frequency of a zero of a compensator gain function and/or a mid-frequency gain of the compensator gain function according to the load current, such that a number of poles of a system open loop gain function of the flyback power converter is at most more than a number of zeroes of the system open loop gain function by one under a crossover frequency.

Abstract: A control chip of a driving circuit for driving a LED array shares a ground terminal with the LED array so that, without an additional winding, the driving circuit can provide a supply voltage for the control chip, implement a zero-current switching function, and implement an over-voltage protection function. Since no additional windings are needed, the related costs and the size of the driving circuit are decreased.

Abstract: A flip-flop circuit includes a first latch, a trigger stage and a second latch. The first latch is configured to latch a selected signal in response to a first state of a clock signal, and provide a first output signal. The trigger stage receives the clock signal and the first output signal to provide a trigger signal. The trigger signal does not toggle as the clock signal transits. The second latch is configured to latch the trigger signal in response to a second state of the clock signal, and provide a second output signal. The first state and the second state of the clock signal are complementary to each other.

Abstract: The present invention provides a flyback power converter, a secondary side control circuit, and a control method thereof. The flyback power converter converts an input voltage to an output voltage, and provides a load current to a load circuit. The flyback power converter includes: a transformer circuit, a power switch circuit, a switch current sense circuit, a primary side control circuit, and a secondary side control circuit. The secondary side control circuit adaptively adjusts a frequency of a zero of a compensator gain function and/or a mid-frequency gain of the compensator gain function according to the load current, such that a number of poles of a system open loop gain function of the flyback power converter is at most more than a number of zeroes of the system open loop gain function by one under a crossover frequency.

Abstract: A flip-flop circuit includes a first latch, a second latch, and a trigger stage. The first latch is configured to set a first latch output signal based on a first latch input signal and a clock signal. The second latch is configured to set a second latch output signal based on a second latch input signal and the clock signal. The trigger stage is configured to generate the second latch input signal based on the first latch output signal. The trigger stage is configured to cause the second input signal to have different voltage swings based on the first latch output signal and the second latch output signal.

Abstract: A set of masks corresponds to an integrated circuit layout. The integrated circuit layout includes a first cell having a first transistor region and a second transistor region, and a second cell having a third transistor region and a fourth transistor region. The first cell and the second cell adjoin each other at side cell boundaries thereof, the first transistor region and the third transistor region are formed in a first continuous active region, and the second transistor region and the fourth transistor region are formed in a second continuous active region. The set of masks is formed based on the integrated circuit layout.

Abstract: The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit is used for driving a light emitting device circuit according to a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a control circuit. The control circuit includes a pulse width modulation (PWM) circuit, a current limit (CL) circuit, and a determination circuit. The CL circuit generates a CL signal according to a current sense signal and a predetermined CL threshold. The determination circuit is coupled to the PWM circuit and the CL circuit, for generating an operation signal according to a PWM signal and the CL signal. The power stage circuit maintains an absolute level of an AC dimming current not lower than a holding current in an ON phase period.

Abstract: A flip-flop circuit is provided. The flip-flop circuit includes a first latch, a trigger stage and a second latch. The first latch is configured to latch a selected signal in response to a first state of a clock signal, and provide a first output signal. The trigger stage, connected to the first latch, is configured to provide a trigger signal based on the clock signal and the first output signal. The second latch, connected to the trigger stage, is configured to latch the trigger signal in response to a second state of the clock signal, and provide a second output signal. The first state and the second state of the clock signal are complementary to each other.

Abstract: The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit is used for driving a light emitting device circuit according to a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a control circuit. The control circuit includes a pulse width modulation (PWM) circuit, a current limit (CL) circuit, and a determination circuit. The CL circuit generates a CL signal according to a current sense signal and a predetermined CL threshold. The determination circuit is coupled to the PWM circuit and the CL circuit, for generating an operation signal according to a PWM signal and the CL signal. The power stage circuit maintains an absolute level of an AC dimming current not lower than a holding current in an ON phase period.

Abstract: A set of masks corresponds to an integrated circuit layout. The integrated circuit layout includes a first cell having a first transistor region and a second transistor region, and a second cell having a third transistor region and a fourth transistor region. The first cell and the second cell adjoin each other at side cell boundaries thereof, the first transistor region and the third transistor region are formed in a first continuous active region, and the second transistor region and the fourth transistor region are formed in a second continuous active region. The set of masks is formed based on the integrated circuit layout.