Abstract:
A de-bounce circuit is disclosed. The de-bounce circuit comprises a wave-shaping circuit, a filtering circuit and a trigger circuit. The wave-shaping circuit is adapted to shape a control signal and output a wave-shaping signal. The control signal may be generated from a mechanical switch. The filtering circuit charges/discharges a capacitor according to the wave-shaping signal, and determines whether to generate a judgment signal according to a voltage of the capacitor. The trigger circuit determines whether to generate an enable signal according to the number of times of the judgment signal.
Abstract:
A driving circuit, comprising a power supply, a transistor unit and a feedback control circuit, is disclosed. The power supply is adaptor to provide an electric power to drive a load. The transistor unit comprises at least one load coupling end to couple to the load for adjusting an amount of current flowing through the load. The feedback control circuit controls an amount of the electric power provided by the power supply according to a voltage level of the least one load coupling end. Wherein, the feedback control circuit comprises an error amplifying circuit and a feedback control switch. The error amplifying circuit generates an error amplified signal according to the voltage level of the least one load coupling end, and the feedback control switch is coupled to an output of the error amplifying circuit and is switched between a turn-on state and a turn-off state based on a dimming signal.
Abstract:
An illumination controller adapted to control a converting circuit to convert an electric power of a DC input power source to drive a light source is provided. The illumination controller includes a dimming unit and a control unit. The dimming unit receives a dimming signal and correspondingly generates a dimming control signal according to the number of the dimming signal. The control unit controls the electric power provided to the light source by the converting circuit according to the dimming control signal, so as to adjust a brightness of the light source. Furthermore, an illumination driving system is also provided.
Abstract:
An LED driving circuit is provided for driving an LED module, comprising a transistor switch and a feedback controller. The transistor switch has a control terminal, a first terminal, and a second terminal. The first terminal is coupled to the LED module and the control terminal receives a control signal for controlling a current passing through the transistor switch. The feedback controller receives a reference voltage and a current detecting signal indicative of the magnitude of the current and generates the control signal accordingly. The feedback controller is connected to a driving power source with level higher than the level of the first terminal of the transistor switch. Hence, the maximum level of an adjustable range of the control signal is higher than the first terminal of the transistor switch.
Abstract:
A power converting circuit including a converting circuit and a controller is provided. In an embodiemnt of the invention, the inductance of the converting circuit and the operation frequency of the controller can be adjusted according to the power required by the load and/or the size of the inductor current to effectively reduce the switching times and the switching loss of the switch in the converting circuit when the load is light. Accordingly, no matter the load is light or heavy, the efficiency of the power converting circuit can be maintained at a higher standard.
Abstract:
A rectifying device is used to prevent any reverse current in a charge pump circuit. Accordingly, energy stored in the charge pump circuit is prevented from being transmitted back to an input voltage source, or energy stored in a capacitor coupled to an output end is prevented from being transmitted back to the charge pump circuit and the input voltage source. Besides, a current limiting unit coupled to the input voltage source or/and the output end is used to protect devices of the charge pump circuit from being burned out due to an overly large current provided by the input voltage source to the charge pump circuit or/and an overly large current provided by the charge pump circuit to the output end when a short circuit occurs.
Abstract:
A MOSFET current limiting circuit, a linear voltage regulator, and a voltage converting circuit are provided. A current limiting value of the MOSFET is adjusted with the temperature or the voltage drop across the drain and the source of the MOSFET. Accordingly, it is ensured that the MOSFET operates in the safe operating area in any situation. Therefore, the MOSFET is prevented from being burnt out, and the reliability thereof is also increased.
Abstract:
A controller which receives electric power required for operating through a driving voltage terminal and controls a converting circuit to convert an input voltage into an output voltage is provided. The controller is latched to stop providing a part or all of functions until the input voltage is removed. Therefore, the issues of the converting circuit in related arts in shortened life-span and safety of users due to can be avoided in the present invention.
Abstract:
An LED driving circuit is provided for driving an LED module, comprising a transistor switch and a feedback controller. The transistor switch has a control terminal, a first terminal, and a second terminal. The first terminal is coupled to the LED module and the control terminal receives a control signal for controlling a current passing through the transistor switch. The feedback controller receives a reference voltage and a current detecting signal indicative of the magnitude of the current and generates the control signal accordingly. The feedback controller is connected to a driving power source with level higher than the level of the first terminal of the transistor switch. Hence, the maximum level of an adjustable range of the control signal is higher than the first terminal of the transistor switch.
Abstract:
An LED driving circuit and a MOSFET switch module thereof is disclosed, and the MOSFET switch module which is used to control a current of the LED driving circuit. The present invention employs a voltage clamping device to clamp the voltage level of the drain of transistor in the MOSFET switch module when being turned off. Via this way, the requirement for the withstand voltage of the transistor is lowered, and so the cost and power consumption thereof is reduced.