Abstract: A dimming circuit includes a resonant unit, a rectification unit, a half-bridge output unit, a first switch device and a second switch device, and a selection unit. The rectification unit is connected to the resonant unit. The half-bridge output unit includes a first electric-controlled switch and a second electric-controlled switch in series. The first and second switch devices are connected to the first and second electric-controlled switches. The selection unit may turn on the first switch device and the second electric-controlled switch when a potential is rising that turns on the discharging lamp and turn off the second switch device and keep turning on the second switch device when the discharging lamp is lighting. The selection unit further turns on the second switch device to turn off the second electric-controlled switch for turning off the discharging lamp in a low power condition.

Abstract: A dimming circuit includes a resonant unit, a rectification unit, a half-bridge output unit, a first switch device and a second switch device, and a selection unit. The rectification unit is connected to the resonant unit. The half-bridge output unit includes a first electric-controlled switch and a second electric-controlled switch in series. The first and second switch devices are connected to the first and second electric-controlled switches. The selection unit may turn on the first switch device and the second electric-controlled switch when a potential is rising that turns on the discharging lamp and turn off the second switch device and keep turning on the second switch device when the discharging lamp is lighting. The selection unit further turns on the second switch device to turn off the second electric-controlled switch for turning off the discharging lamp in a low power condition.

Abstract: A three-level dimming circuit for a discharging lamp includes a first contact, a second contact, and a third contact, a first full-wave rectification circuit connected to the first contact and the third contact, and a second full-wave rectification circuit connected to the first contact and the second contact. A selection circuit includes three resistors and a first electrical controlled switch. A half-wave rectification circuit includes a second electrical controlled switch and a third electrical controlled switch in series connection. The three resistors of the election circuit are the main devices for dimming that the present invention has a lower cost and superior competition in the market.

Abstract: A electric discharge light regulation matching circuit that operates with filaments includes a resonance unit, a converter unit, a charge circuit, a half-bridge output unit and a lamp. The converter unit is connected to the resonance unit to convert an AC current to a DC current. The charge circuit, which has a charge capacity, is connected to the converter unit. The half-bridge output unit includes two electric control switches in series connection. The lamp, which is connected to the charge circuit, includes a first filament and a second filament therein. The first filament has an end connected to the charge capacity to heat the first filament directly that may prevent a flicker problem of the lamp connecting the electric control switch and may provide functions of recycling power and preventing temperature rising.

Abstract: An inexpensive electric discharge light-regulation matching circuit for use with a standard light regulator to regulate the light of an electric discharge without causing flickering is disclosed to include a resonance unit, which comprises a first capacitor and a second capacitor connected in series and a first inductance connected in parallel to the first capacitor and second capacitor, a converter circuit connected to the resonance unit for converting an alternating current into a direct current, a half-bridge output unit, which comprises two electrically controlled switches connected in series to the converter unit with the respective control end respectively connected to a respective oscillation unit, and a voltage feedback unit, which is connected to the half-bridge output unit and the converter unit and comprises a second inductor, a third capacitor and a fourth capacitor that are connected in series.

Abstract: A lighting module power-saving control method in which a switching control loop is installed in a lamp for outputting a high-frequency current output signal and a low-frequency current output signal, the length of a unit time is divided into multiple equal parts for enabling the power output loop of the lamp to alternatively output a normal-consumption current and a power-saving current to the lighting module of the lamp subject to the control of the switching control loop, and the frequency of the supply of the normal-consumption current is not less than 16 times/second.

Abstract: A dimming circuit for a gas-discharge lamp includes a first terminal and a second terminal for inputting AC power, a variable resistor and a capacitor connected with the respective first end to each other and the respective second end to the first input terminal and the second input terminal respectively, a bi-directional diode connected with one end to the first end of the variable resistor and the first end of the capacitor, a TRIAC, which has the gate thereof connected to the second end of the bi-directional diode and one end connected to the second input terminal, and a switch connected in series between the second input terminal and the capacitor for circuit on/off control, for enabling the light intensity of the gas-discharge lamp to be regulated subject to change of the resistance value of the variable resistor.

Abstract: A dimming circuit for a gas-discharge lamp includes a first terminal and a second terminal for inputting AC power, a variable resistor and a capacitor connected with the respective first end to each other and the respective second end to the first input terminal and the second input terminal respectively, a bi-directional diode connected with one end to the first end of the variable resistor and the first end of the capacitor, a TRIAC, which has the gate thereof connected to the second end of the bi-directional diode and one end connected to the second input terminal, and a switch connected in series between the second input terminal and the capacitor for circuit on/off control, for enabling the light intensity of the gas-discharge lamp to be regulated subject to change of the resistance value of the variable resistor.