Patent application number | Description | Published |
20120062149 | LIGHT EMITTING DIODE DRIVING INTEGRATED CIRCUIT - A driving integrated circuit of light emitting diodes is used for driving at least one light emitting diode. The driving integrated circuit includes a current setting pin, a regulator circuit, and an adjuster. The driving integrated circuit sets a target current for a current flowing through the at least one light emitting diode according to an outflowing current of the current setting pin. The adjuster adjusts a target voltage according to the outflowing current. Then the regulator circuit provides a supply voltage for driving the light emitting diode so as to regulate a terminal voltage of the light emitting diode to the target voltage. | 03-15-2012 |
20120112644 | LIGHT EMITTING DIODE DRIVING INTEGRATED CIRCUIT AND METHOD FOR DRIVING A SERIES OF LIGHT EMITTING DIODES - A driving integrated circuit of light emitting diodes is used for driving a plurality of series of light emitting diodes. The driving integrated circuit includes a current setting pin, a regulator circuit, and an adjuster. The driving integrated circuit sets a target current for a current flowing through the plurality of series of light emitting diodes according to an outflowing current of the current setting pin. The adjuster adjusts a target voltage according to the outflowing current. Then the regulator circuit provides a supply voltage for driving the plurality of series of light emitting diodes, so as to regulate a terminal voltage of the plurality of series of light emitting diodes to the target voltage. | 05-10-2012 |
20120161634 | Light Emitting Module Driving Circuit and Related Method - A light emitting module driver circuit utilized for driving a light emitting module includes a voltage dividing module, a short circuit detection module, and a driving module. A method of performing short circuit protection in the light emitting module driver circuit includes disabling the driving module during a dimming off cycle of the light emitting module driver circuit, enabling the voltage dividing module during the dimming off cycle, dividing a voltage of the light emitting module to generate a divided voltage during the dimming off cycle, and generating a short circuit protection signal according to the divided voltage during the dimming off cycle. | 06-28-2012 |
20120293215 | DRIVING CIRCUIT HAVING CURRENT BALANCING FUNCTIONALITY - A driving circuit having current balancing functionality includes a control unit, a bias resistor, a current switch unit and plural current driving modules. The control unit is utilized for generating a control signal having at least one bit according to a control current. The bias resistor is put in use for providing a bias voltage according to a bias current. The current switch unit employs the control signal and plural bias setting currents to generate the bias current, for keeping the bias voltage within a preset voltage range. The current driving modules are used to provide plural driving currents according to the bias voltage and the control signal. Each current driving module includes a current-limit control unit which is utilized for controlling a corresponding driving current according to the control signal. | 11-22-2012 |
20130088158 | LIGHT EMITTING DIODE DRIVING INTEGRATED CIRCUIT WITH A MULTI-STEP CURRENT SETTING FUNCTION AND METHOD OF SETTING A MULTI-STEP CURRENT OF A LIGHT EMITTING DIODE DRIVING INTEGRATED CIRCUIT - A light emitting diode driving integrated circuit with a multi-step current setting function includes a regulator circuit, a variable resistor circuit, and a current generation unit. The regulator circuit provides a supply voltage to a first terminal of at least one series of light emitting diodes to drive the at least one series of light emitting diodes, and regulates a second terminal voltage of the at least one series of light emitting diodes to a target voltage. The variable resistor circuit is used for changing a resistance of the variable resistor circuit in a plurality of steps according to a switching signal. The current generation unit is coupled to the variable resistor circuit for changing current flowing through the at least one series of light emitting diodes in a plurality of steps according to a reference voltage and variation of the resistance of the variable resistor circuit. | 04-11-2013 |
20130114167 | SHORT PROTECTION CONTROL CIRCUITS AND RELATED CONTROL METHODS - Short protection control circuits and related control methods are disclosed. A disclosed short protection control circuit is adapted for controlling a short protection mechanism providing short protection to several LED chains. The disclosed short protection control circuit has a detection circuit, a first logic circuit and a timer. Coupled to the LED chains, the detection circuit asserts an indication signal when one of the node voltages of the LED chains is lower than an under-current reference. When the indication signal is enabled, the first logic circuit starts blocking the short protection mechanism. The timer times to provide a result when the short protection mechanism is blocked. When the result indicates that the short protection mechanism has been blocked for at least a predetermined time period, the first logic circuit resumes the short protection mechanism. | 05-09-2013 |
20150028752 | CONTROL CIRCUIT OF LIGHT EMITTING DIODES AND OPERATION METHOD OF A CONTROL CIRCUIT OF LIGHT EMITTING DIODES - A control circuit of light emitting diodes is used for driving at least one series of light emitting diodes. The control circuit includes a current setting pin, a driving current generator, a regulator circuit, and an adjuster. A reference current flows through the current setting pin. The driving current generator is used for generating a driving current flowing through the series of light emitting diodes according to the reference current. The adjuster generates an adjustment voltage according to the reference current. Then, the regulator circuit generates a supply voltage to drive the series of light emitting diodes, and regulates a voltage of a first terminal of the series of light emitting diodes at a target voltage according to the adjustment voltage. The target voltage is increased with decrease of the driving current when the driving current is less than a first predetermined current. | 01-29-2015 |
20150237690 | CAPACITANCE AMPLIFYING CIRCUIT APPLIED TO A CONTROLLER OF A POWER CONVERTOR AND OPERATION METHOD THEREOF - A capacitance amplifying circuit applied to a controller of a power convertor includes a comparison unit and a capacitance amplifying module. The comparison unit receives a feedback voltage corresponding to a load coupled to the power convertor, a dimming signal, and a reference voltage, and outputs a compensation current. The capacitance amplifying module generates an equivalent capacitor. A capacitance of the equivalent capacitor is K times to a capacitance of a reference capacitor of the capacitance amplifying module, and K is a real number greater than 1. The compensation current and the equivalent capacitor are used for determining a compensation voltage, and when the dimming signal is disabled, a closed loop within the capacitance amplifying module is changed to an open loop to keep the compensation voltage at a fixed value. | 08-20-2015 |