40results about How to "With dimming function" patented technology

The present invention discloses a high-voltage linear constant-current LED drive circuit, which comprises a rectifier and filter circuit, an LED load group, an op-amp power supply circuit, a constant-current control circuit and a PFC adjusting circuit. The constant-current control circuit ensures the current flowing through the LED load group to be constant based on the feedback control process. The PFC adjusting circuit improves the waveform of the input current and increases the power factor through adjusting the voltage drop of the LED load group. The rectifier and filter circuit is respectively connected with the op-amp power supply circuit, the LED load group and the PFC adjusting circuit. The op-amp power supply circuit is connected with the constant-current control circuit and the PFC adjusting circuit. The constant-current control circuit is connected with the LED load group. The PFC adjusting circuit is connected with the LED load group. The circuit is simple and reasonable in structure, wherein the linear constant-current function of high PFC, high efficiency and high flexibility is realized based on the current feedback control and the lamp bead segmented control.

The invention discloses a light dimming method using a switch-type switch and a related lighting system. In the light dimming method, the brightness of a lamp tube group is adjusted according to the state of the switch-type switch. The light dimming method comprises the following steps of: when the lamp tube group is in an initial state, determining the moment to be a first state of the switch-type switch; after the switch-type switch is switched to a second state from the first state at a first time point, gradually adjusting the brightness of the lamp tube group to second brightness from first brightness within the light dimming time from the first time point; within the light dimming time from the first time point, switching the switch-type switch to the first state from the second state at a second time point, switching to the second state from the first state at a third time point; and when the interval between the second time point and the third time point is not greater than a turn-off time, remaining the lamp tube group at the brightness at the second time point. By the method, a light dimming function can be provided by using a conventional switch-type switch.

The invention discloses a high-power dimming electrodeless lamp. The high-power dimming electrodeless lamp comprises an anti-electromagnetic interference filter, a bridge rectifier module, an active power factor corrector, a half-bridge inverter oscillatory circuit, a power output device, a starting controller, a high-frequency coupler, a dimming circuit and an HB0809 integrated circuit, wherein the half-bridge inverter oscillatory circuit is used for converting a direct current voltage into a high-frequency alternating voltage; the power output device is used for supplying output power to the half-bridge inverter oscillatory circuit when the half-bridge inverter oscillatory circuit works; the starting controller is used for controlling the turning on and turning off of the electrodeless lamp; the high-frequency coupler is used for coupling electric energy of the active power factor corrector and the power output device to the lamp tube of the electrodeless lamp; the dimming circuit is connected with an externally connected dimming control circuit; when the externally connected dimming control circuit supplies a 0 to 10-volt direct current (VDC) dimming control voltage signal to the dimming circuit, the dimming circuit works and then converts the alternating voltage into a 18-volt direct voltage; and the HB0809 integrated circuit is connected to the half-bridge inverter oscillatory circuit and used for controlling the alternately turning on and turning off of a first metal oxide semiconductor (MOS) tube and a second MOS tube in the half-bridge inverter oscillatory circuit to set working frequency, ignition time and ignition frequency. By a dimming electrodeless lamp circuit, a dimming function of the high-power electrodeless lamp can be realized.

The invention provides a dual-frequency lighting mixed pulse width modulation dimming electronic ballast, relating to an electronic ballast. The invention provides a dual-frequency lighting mixed pulse width modulation dimming electronic ballast which can ensure the lightness of the lamp to be in 100% to 30% with reliable light modulation, leads to no flashing lamp phenomenon, is convenient for being applied in single-line illumination control circuits and can be widely applied to existing energy-saving lamps and ballasts. The invention is provides with a rectification circuit, a zero cross detection circuit, a system control circuit, a dual-frequency point power output circuit and a lamp driving circuit. The input terminal of the rectification circuit is externally connected with a power supply; the input terminal of the zero cross detection circuit is connected with the output terminal of the rectification circuit; the input terminal of the system control circuit is connected with the output terminal of the zero cross detection circuit; the power supply input terminal of the dual-frequency point power output circuit is connected with the output terminal of the rectification circuit; the control input terminal of the dual-frequency point power output circuit is connected with the system control circuit; the input terminal of the lamp driving circuit is connected with the output terminal of the dual-frequency point power output circuit; the output terminal of the lamp driving circuit is externally connected with loads.

The invention provides an endoscope probe. The endoscope probe comprises a light-guide fiber probe. A camera shooting channel, a fluorescence-excited light output channel, a white light output channel and a biopsy channel are arranged in the light-guide fiber probe. A camera is installed in the camera shooting channel, and a white light source is installed in the white light output channel. A camera signal output port, a fluorescence-excited light output interface, a power interface and a biopsy channel inlet are formed in the rear end of the light-guide fiber probe. Novel inherent fluorescence tumor diagnostic apparatus comprises the endoscope probe and a base. A displayer is arranged on the upper surface of the base, an inherent fluorescence generator and a fluorescence-excited light output end are arranged on the side face of the base, the fluorescence-excited light output interface is connected with the fluorescence-excited light output end, and the camera signal output port is connected with the displayer through a guide wire. According to the diagnostic apparatus, a former diagnosis method is abandoned, through perfect combination with a hysteroscope, precancerous lesions can be diagnosed earlier, and precancerous lesion tissue can be accurately found and taken out through the biopsy channel.

The invention discloses a wide input range outdoor optical recording LED high power density conversion method. A charging part having an MPPT function and an LED constant current driving part are provided. By deeply analyzing basic characteristics of a solar cell, a storage battery, and an LED, a bidirectional synchronous rectification DC-DC converter having a main topology based on a Buck-Boost type is designed. During the forward operation of the DC-DC converter, a charging circuit adopts a Buck type topological structure, and is used to charge the storage battery by using an MPPT, constant voltage, constant current combination three-phase charging method. During the backward operation of the DC-DC converter, a discharging circuit adopts a Boost type topological structure, the constant voltage output of the LED lamp is realized, and a PWM dimming function is provided. By adopting an improved control method based on a conventional perturbation observation method, and according to the I-V characteristic of the solar cell, an increment of each time is converted into the step size of the next time actually approaching a control voltage, and therefore overcontrol is prevented, and frequency perturbation is reduced during a steady state of a component.

Provided is a sunshade apparatus (1) disposed under a sunroof panel (S3) installed in a fixed roof (S1) of a vehicle (S), comprising a frame (3) having a plurality of frame openings (13) arranged in a width direction of the vehicle, and a plurality of polarizing panel sets (5) each of which is disposed correspondingly to one of the frame openings. The frame is formed to be higher in the middle portion thereof than both end portions thereof in the width direction so as to follow the shape of the fixed roof (S1), and each polarizing panel set inclines to be higher as approaching the middle portion of the vehicle in the width direction.

The invention provides a split type multi-energy-saving lamp illumination system. The system is formed by connecting a bridge-type output end of a rectifying circuit to a high-frequency transformation circuit, then connecting the half-bridge output of the high-frequency transformation circuit to a filter circuit, and finally connecting to a driving circuit. The invention comprises the following steps: firstly, rectifying an AC and correcting by adding APFC power; then, carrying out high-frequency transformation and adding frequency modulation to adjust light to obtain the high-frequency AC; and finally connecting to a plurality of driving circuits by LC filtration to respectively drive a plurality of energy-saving lamps. By adopting the technical scheme, one high-performance ballast can drive a plurality of energy-saving lamps, and has the light-adjusting function without additionally arranging control circuits on the lamps. The split type energy-saving lamps have high power factors for avoid adding APFC circuit corrected power on each lamp. Due to the reasons, the split type energy-saving lamps can use less electronic parts, decreases the size and the finished products, has low working temperature and longer electronic part service life than that of a common energy-saving lamp and reduces the generation of electronic garbage so as to be environment-friendly and energy-saving and have practical values.

This invention is about lamp especially about compact adjustable electromagnetism inductive lamp. It contains a magnetic induction coil, it can be controlled by the circuit of high frequency current transport to the magnetic ring, and the ring produces higher strength of magnetic induction. The alternating magnetic field bring electric magnetic energy come into the inner of the lamp, then produce voltage to make the gas and mercury ionize. The ionized atoms of mercury project to ultraviolet ray shoot on the powder of fluorescence then the lamp is bright.

The invention relates to an LED lamp with a dimming function. The LED lamp comprises an LED lamp body; a dimming assembly arranged on the LED lamp body and changing the resistance value of the dimmingassembly according to the adjusting signal and / or operation; a control device arranged in the LED lamp body, electrically connected with the dimming assembly and used for detecting the resistance value of the dimming assembly and adjusting the output current according to the resistance value of the dimming assembly; and an output unit connected with the control device, receiving the output current and transmitting the output current to the LED lamp. The LED lamp has the dimming function, has no requirement for the dimming function of a chip, does not need to use a dimmer or be matched with agateway, a sensor, a remote controller and the like, and is simple in dimming function, low in cost and convenient to use.

The invention relates to an electrodeless lamp device having a light adjusting function. The electrodeless lamp device is connected with an external power source, and comprises an electrodeless lamp, a ballast, and a control unit. The electrodeless lamp comprises a lamp body, a magnetic ring coiled on the outer side of the lamp body, a coil used to wind the magnetic ring. The ballast is electrically connected with the coil, and the control unit is electrically connected with the ballast, and can be used to control the ballast. The ballast can be used to convert the external power source into a frequency voltage, therefore the required color temperature and the wave length strength of the electrodeless lamp can be provided. The environmental illumination can be controlled, the proper light can be provided, and the illumination costs can be reduced.

The invention provides a split type multi-energy-saving lamp illumination system. The system is formed by connecting a bridge-type output end of a rectifying circuit to a high-frequency transformation circuit, then connecting the half-bridge output of the high-frequency transformation circuit to a filter circuit, and finally connecting to a driving circuit. The invention comprises the following steps: firstly, rectifying an AC and correcting by adding APFC power; then, carrying out high-frequency transformation and adding frequency modulation to adjust light to obtain the high-frequency AC; and finally connecting to a plurality of driving circuits by LC filtration to respectively drive a plurality of energy-saving lamps. By adopting the technical scheme, one high-performance ballast can drive a plurality of energy-saving lamps, and has the light-adjusting function without additionally arranging control circuits on the lamps. The split type energy-saving lamps have high power factors for avoid adding APFC circuit corrected power on each lamp. Due to the reasons, the split type energy-saving lamps can use less electronic parts, decreases the size and the finished products, has low working temperature and longer electronic part service life than that of a common energy-saving lamp and reduces the generation of electronic garbage so as to be environment-friendly and energy-saving and have practical values.

The invention relates to a cold cathode desk lamp which comprises a lamp cap, a lamp holder, a switch and a power line, wherein a rotating device is arranged on the lamp holder; the lamp cap is connected with the lamp holder through the rotating device; a light source fixing plate is arranged in the lamp cap; a cold cathode lamp and an inverter are fixed on the light source fixing plate; a reflective material is arranged on the light source fixing plate; the caliber of the cold cathode lamp is 2.4mm-8.0mm, and the cold cathode lamp is an M-shaped lamp, a U-shaped lamp, an MU-shaped lamp or a straight lamp; an intelligent IC half-bridge driven control chip is adopted by the inverter; and a touch switch is adopted. The cold cathode desk lamp of the invention has stable light rays, frequent switching resistance and good color rendering, does not have stroboscopic and flickering phenomena, can effectively protect the vision and effectively improve the lighting effect, has long service life, and is favorable for environmental protection.

The invention discloses a dimmable LED constant current source drive circuit which comprises a dimming signal processing circuit for receiving dimming voltage, converting the dimming voltage into an input signal and transmitting the input signal to a current control circuit; a current acquisition circuit which is used for feeding back a signal representing the real-time current of the circuit to the current control circuit; the current control circuit which receives the input signal transmitted by the dimming signal processing circuit and the signal fed back by the current acquisition circuit,and outputs a signal to a boost converter control circuit; a voltage acquisition circuit which feeds back an output voltage magnitude signal to the boost converter control circuit; the boost converter control circuit which controls a boost converter circuit to output the corresponding voltage so that the output current is constant. The dimmable constant-current source is a single-stage boosting circuit, the function loss of the dimmable constant-current source is only one stage and is much smaller than that of a traditional two-stage circuit, the heat production amount is reduced, and the service life of components is indirectly prolonged; through actual calculation and measurement, the efficiency is as high as 98%, and the practicability is high.

The invention relates to a non-isolating switching power supply with high efficiency and a high current regulation ratio. The power-supply efficiency can be up to 98% and considerably exceeds 90% power-supply efficiency of an existing switching power supply; and the most important feature is that the output current regulation ratio of the power supply even reaches five per hundred thousand per volt, and considerably exceeds the level of the similar power supply at present. The power supply is small in volume; the number of used elements can be as low as15; and a cooling fin is not needed, so that the cost is low. The output power of the non-isolating switching power supply can reach 150W; the output voltage can be up to 300V; and the lowest output voltage is 0V, so that a short circuit can be achieved; and the non-isolating switching power supply can also have a dimming function. If the non-isolating switching power supply is applied to an LED lamp, the technical problems that an existing drive power supply for the LED lamp is relatively high in energy consumption, not high enough in power-supply efficiency, poor in stability, easy to damage and the cooling fin is a mustare solved.

The invention is applicable to the field of fluorescent lamp lighting, and provides a fluorescent lamp electronic ballast and a lighting device; the fluorescent lamp electronic ballast comprises an EMI circuit, a rectifying circuit, an oscillating circuit, an inverting circuit, an active power factor correction circuit, a control circuit and a sampling circuit, wherein the input end of the activepower factor correction circuit is connected to the output end of the rectifying circuit, and a first output end is connected to the input end of the inverting circuit; the input end of the sampling circuit is connected with a fluorescent lamp and carries out sampling on working current of the fluorescent lamp; and the sampling end of the control circuit is connected to the output end of the sampling circuit, the input end thereof is connected to a second output end of the active power factor correction circuit, the output end thereof is connected to the control end of the oscillating circuit, and the control end thereof is connected to the control end of the inverting circuit. The electronic ballast provided by the invention adopts the active power factor correction circuit, and leads a conduction angle of an input circuit to be widened by combining the control circuit and the sampling circuit, thus leading the electronic ballast to work stably in the wide voltage range of 85V-300V.

The invention discloses a high-voltage linear constant-current LED drive circuit, which includes a rectification filter circuit, an LED load group, an operational amplifier power supply circuit, a constant-current control circuit and a PFC adjustment circuit, wherein: the constant-current control circuit uses feedback control to maintain Through the constant current in the LED load group; the PFC adjustment circuit improves the waveform of the input current by adjusting the voltage drop of the LED load group, and improves the power factor; the rectification filter circuit is respectively connected to the operational amplifier power supply circuit, the LED load group and PFC adjustment circuit; the operational amplifier power supply circuit is connected to the constant current control circuit and the PFC adjustment circuit, the constant current control circuit is connected to the LED load group, and the PFC adjustment circuit is connected to the LED load group. The circuit structure of the present invention is simple and reasonable, and realizes the linear constant current function with high PFC, high efficiency and high flexibility through current feedback control and segmental control of lamp beads.