Macroblock Inc. | Date: 2016-10-07
A voltage control device includes an output module and a control module. The output module provides an output current at an output terminal thereof based on a control voltage. The control module includes a comparing circuit, a capacitor, a charging circuit and a discharging circuit. The comparing circuit compares a to-be-compared voltage, which is associated at least with a to-be-controlled voltage at the output terminal of the output module, with a predetermined reference voltage to generate a comparison signal. The capacitor provides the control voltage. The charging circuit is operable to charge the capacitor based on the comparison signal. The discharging circuit is operable to discharge the capacitor based on the comparison signal.
Macroblock Inc. | Date: 2017-05-24
An Alternating-current-Direct-current (AC-DC dual-use) Light Emitting Diode (LED) driving circuit includes an input power circuit, a buck-boost converter, and a Pulse Width Modulation (PWM) signal controller. The buck-boost converter, including a switching transistor, a feedback resistor, a low pass filter and a free-wheeling diode, receives a current signal output from the input power circuit, and drives an LED with a driving signal. The PWM signal controller outputs a PWM signal according to the feedback signal passing through the low pass filter, so as to sequentially turn on and turn off the switching transistor. Two ends of the free-wheeling diode are respectively connected to the low pass filter and the LED. A floating ground terminal of the PWM signal controller is coupled to the switching transistor and the low pass filter. Two ends of the feedback resistor are respectively connected to the floating ground terminal and the low pass filter.
Macroblock Inc. | Date: 2017-05-31
A power semiconductor device includes a substrate (2), a main body (3), and an electrode unit (4). The main body (3) includes an active portion (31) disposed on the substrate (2), an edge termination portion (32), and an insulating layer (34) disposed on the edge termination portion (32) . The edge termination portion (32) includes a first-type semiconductor region (321), a second-type semiconductor region (321) and a top surface (320). The first-type semiconductor region (321) is adjacent to the active portion (31) and has a first-type doping concentration decreased from the top surface (320) toward the substrate (2). The electrode unit (4) includes a first electrode (41) disposed on the insulating layer (34), and a second electrode (42) disposed on the substrate (2).
Macroblock Inc. | Date: 2016-06-22
In a method for driving a light-emitting diode (LED) device, a driving system is configured to: a) receive a number of driving signals, each corresponding to a period the LED device is to be activated; b) determine a number of repetitions for output of each of the driving signals; c) determine an average driving period for each of the driving signals; d) constructing a sequence list of driving signals to be sent to the LED device, the sequence list including a plurality of rows, each of the rows is numbered and includes two columns for containing respectively two entries of the driving signals therein; and e) sequentially transmit the two entries of the driving signals contained in each of the rows included in the sequence list to the LED device.
Macroblock Inc. and Harvatek Corporation | Date: 2015-03-27
A display structure includes a main body, a plurality of light-emitting diode units, and a plurality of light blocking walls. The main body includes a substrate, and a circuit unit disposed on the substrate. The light-emitting diode units are electrically connected to the circuit unit and illuminate outwardly. Each of the light blocking walls is disposed between two adjacent ones of the light-emitting diode units to prevent light interference between the two adjacent ones of the light-emitting diode units.
Macroblock Inc. | Date: 2014-09-15
A driving system for a light emitting device includes a data latch unit to store first logic data, a shift register unit to store second logic data, a multiplexer unit to selectively output the first and second logic data, and a driving unit converting the logic data outputted by the multiplexer unit into a driving output that is provided to the light emitting device.
Macroblock Inc. | Date: 2014-02-19
A light-emitting diode (LED) driving circuit includes a power factor correction (PFC) circuit and a driving controller. The PFC circuit controls a power factor of the LED driving circuit. The LED driving circuit includes an inductor, a switch, a current detection circuit, and a time detection circuit. The inductor senses an inductor current and provide energy to at least one LED. The switch connected to the inductor is conducted according to a driving signal. The current detection circuit connected to the switch detects inductor current information. The time detection circuit connected to the switch detects an energy discharging time during which the inductor current decrease from a peak value to zero. The driving controller connected to the switch, the current detection circuit, and the time detection circuit outputs the driving signal to the switch according to the voltage level and the energy discharging time.
Macroblock Inc. | Date: 2014-02-12
A LED driving device adapted to driving N LED strings connected in series is provided. N is a positive integer greater than 1. The LED driving device includes (N-1) switch units, a current source, a detection unit and a control unit. The ith switch unit electrically connects to the (i+1) LED string in parallel or to the ith LED string in parallel, and 0 < i (N-1). The current source supplies a driving current to drive the N LED strings. The detection unit outputs a detection signal according to a voltage of the current source, a first reference voltage and a second reference voltage. The control unit outputs a plurality of first control signals according to the detection signal to dynamically control an amount of the (N-1) switch units turned on.
Macroblock Inc. | Date: 2015-03-25
A driving system for a light emitting device includes a data latch unit (5) to store first logic data, a shift register unit (3) to store second logic data, a multiplexer unit (6) to selectively output the first and second logic data, and a driving unit (7) converting the logic data outputted by the multiplexer unit (6) into a driving output that is provided to the light emitting device.
Macroblock Inc. | Date: 2014-01-01
A common-core power factor correction resonant converter includes an energy-transforming circuit. The energy-transforming circuit receives an input line voltage and generates an output power. The energy-transforming circuit includes a coupling inductor and a charge-storage capacitor. The coupling inductor and the charge-storage capacitor are charged by the input line voltage in response to a control signal, so as to generate a charge-storage capacitor voltage. When the charge-storage capacitor voltage is charged to a preset voltage level, the coupling inductor and the charge-storage capacitor are discharged according to the control signal. Then, the energy in the coupling inductor and the charge-storage capacitor is transformed to the output load and provide the output voltage or current regulation.