411results about How to "Simple control circuit" patented technology

A lamp comprising a solid state light emitter, the lamp being an A lamp and providing a wall plug efficiency of at least 90 lumens per watt. Also, a lamp comprising a solid state light emitter and a power supply, the emitter being mounted on a heat dissipation element, the dissipation element being spaced from the power supply. Also, a lamp, comprising a solid state light emitter and a heat dissipation element that has a heat dissipation chamber, whereby an ambient medium can enter the chamber, pass through the chamber, and exit. Also, a lamp, comprising a light emissive housing at least one solid state lighting emitter and a first heat dissipation element. Also, a lamp comprising a heat sink comprising a heat dissipation chamber. Also, a lamp comprising first and second heat dissipation elements. Also, a lamp comprising means for creating flow of ambient fluid.

In a left ventricular assist device (LVAD) a rotodynamic blood pump (10) is powered by a brushless DC motor (12). A power supply (14) supplies power to the motor (12). Three feedback channels, one for each of voltage, current, and motor speed lead to a microcontroller or microprocessor (18). The three feedback waveforms are analyzed, and from these waveforms, motor input power, patient heart rate, current pump flow rate, and systemic pressure are determined. The microprocessor (18) then calculates a desired flow rate proportional to the patient heart rate. The microprocessor communicates a new power output to a commutation circuit (16), which regulates power to the motor (12). The pump (10) also includes safety checks that are prioritized over desired pump flow. These include prevention of ventricular suction, low pulsatility, minimum and maximum pump speed, minimum speed-relative pump flow, minimum absolute pump flow, minimum and maximum motor input power.

There is provided a lighting device that comprises at least one 600-630 nm solid state light emitter and at least one light source emitting light within an area on a 1931 CIE Chromaticity Diagram defined by a first set of points having x, y coordinates of (0.32, 0.40), (0.36, 0.48), (0.43, 0.45), (0.42, 0.42), (0.36, 0.38), or a second set of points having x, y coordinates of (0.29, 0.36), (0.32, 0.35), (0.41, 0.43), (0.44, 0.49), (0.38, 0.53). Some embodiments further comprise at least a first power line. Also provided are methods that comprise illuminating at least one light source to emit light within one of the areas defined above, and illuminating at least one 600-630 nm emitter.

A bidirectional active power conditioner includes a DC side, a bidirectional DC/DC power converter, a DC/AC inverter and an AC side. The DC side electrically connects with a DC source while the AC side electrically connects with a load and an AC source. The bidirectional DC/DC power converter is controlled via high-frequency pulse width modulation (PWM) switching so as to generate a predetermined DC voltage or DC current while the DC/AC inverter is controlled to convert the predetermined DC voltage or DC current into a predetermined AC voltage or AC current.

An illumination device is provided having one or more illumination LEDs configured to provide illumination for the device. Along with the illumination LED is a reference LED. The illumination LED provide illumination during normal operation of the device, whereas the reference LED provides a reference illumination, but does not provide illumination during normal operation. A light detector can detect light from the illumination LED and the reference LED, and control circuitry can be used to compare light detected from the reference LED and the illumination LED to adjust a brightness for the device. The light detector can comprise a photo-detector or can comprise an LED, such as one of the illumination LEDs if more than one illumination LED is utilized. A method is also provided for controlling brightness of an illumination device.

A single-inductance double-output switch power supply based on ripple control comprises a power level module, a filter and voltage sampling module, a secondary voltage sampling module, a secondary ripple control module, a primary voltage sampling module, a primary control module and a driving module, wherein the output of the power level module is connected with the filter and voltage sampling module, the output of the filter and voltage sampling module is connected with each of the secondary voltage sampling module and the primary voltage sampling module, the output of the secondary voltage sampling module is connected with the secondary ripple control module, the output of the primary voltage sampling module is connected with the primary control module, the outputs of the secondary ripple control module and the primary control module are connected with the driving module, and the output of the driving module is connected with the power level module and the secondary ripple control module and also outputs a slope compensation power source Islope signal to the secondary voltage sampling module.

A semiconductor device includes an IGBT, a constant voltage circuit, and protection Zener diodes. The IGBT makes/breaks a low-voltage current flowing in a primary coil. The constant voltage circuit and the protection Zener diodes are provided between an external gate terminal and an external collector terminal. The constant voltage circuit supplies a constant gate voltage to the IGBT to thereby set a saturation current value of the IGBT to a predetermined limiting current value. The IGBT has the saturation current value in a limiting current value range of the semiconductor device.

A projection-type image display apparatus for displaying an image on a projected plane, includes light sources each configured to emit a light, a light-path combining element configured to combine light paths of the lights each emitted from the light sources, a light path splitting element configured to split the lights on the combined light path into first and second lights, a scanning mirror configured to reflect the first lights to scan the projected plane with the first lights, a light receiving element configured to receive the second lights to detect light amounts of the received second lights, and a control circuit configured to control the scanning mirror to scan an image forming area of the projected plane with the first lights based on image data and control the light sources so as to reproduce a color based on the image data. The control circuit is configured to control the light receiving element to detect the light amounts of the light sources when the image forming area is scanned with the first light, and adjust emitting light amounts of the light sources based on the detected light amounts of the light sources.

A method for generating low color temperature light and a light emitting device adopting the same, comprise a LED component, phosphor capable to be excited by the emission light of the LED component, and a package colloid for encapsulating the LED component and the phosphor, wherein the package colloid is provided with a electrode lead for connecting the LED component with the external power supply, the peak wavelength of emission light of the LED light is 460-500 nm, the peak wavelength of emission light of the excited phosphor is 580-630 nm. The present invention only use one chip and one kind of phosphor to generate the low color temperature light which is of the same effect as that of the minitype tungsten lamp or the high pressure sodium lamp, and is of advantages including energy saving, low cost and environmental protection, etc. The present invention can be widely used in the manufacturing process of LED lamp of low color temperature, especially in the manufacturing the mini LED bulb.

An electro-optical device may include a plurality of data lines, a plurality of selection lines, a plurality of unit circuits, a selection circuit, and a control circuit. Each of the plurality of unit circuits is connected to a corresponding one of the plurality of data lines and a corresponding one of the plurality of selection lines. The plurality of unit circuits form a unit circuit group for each of the selection lines. The selection circuit supplies a selection signal to one of the plurality of selection lines so that data signals are written from the plurality of data lines to the corresponding unit circuit group during a selection period when the corresponding unit circuit group is selected. The control circuit supplies a common control signal to the unit circuits included in a group consisting of two or more of the unit circuit groups. The control circuit brings the control signal into a predetermined state during a period that is different from the selection period when any one of the two or more unit circuit groups is selected. Here, each of the plurality of unit circuits includes an electro-optical element, a first switching element, a driving transistor. The first switching element writes the data signal from one of the plurality of data lines to the corresponding unit circuit in accordance with the selection signal. The gate of the driving transistor is supplied with a voltage corresponding to the data signal. The driving transistor supplies a driving current to the electro-optical element.

Circuits and methods to achieve a buck-boost converter, capable to achieve a constant output voltage by pre-charging of an inductor if the input voltage is close to the output voltage has been achieved. The prior art problem of output voltage variations occurring while the input voltage is close to the output voltage is avoided. In case the input voltage is lower than a defined threshold voltage or the duty cycle exceeds a defined maximum allowable level, the inductor of the converter is pre-charged followed by boosting of the energy of the inductor to the output of the converter. In both modes the control loops of the buck converter can be used for buck duty cycle control. The duration of the pre-charge depends upon the level of the input voltage, the lower the input level is the longer is the pre-charge performed.

An electronic ballast provides fault detection and safety features for overcurrent protection and hard switching at a half bridge. A voltage controlled oscillator supplies a switching frequency that is modifiable based on operationalfeedback parameters. A feedback circuit senses load current and output voltage to determiner fault conditions and to provide control information for adaptively adjusting the frequency of the voltage controlled oscillator. By appropriately controlling the voltage controlled oscillator output, the electronic ballast maintains a zero volt switching with minimum current switching to achieve an efficient and robust electronic ballast control. The entire control is integrated on a single integrated circuit.

The invention relates to a circuit capable of realizing PFC (Power Factor Correction) flow-equalization parallel connection and a control method thereof. The circuit comprises at least two parallel PFC circuits, a sampling circuit and a hardware circuit, wherein the sampling circuit comprises the steps of sampling input mains voltage, sampling output mains voltage and sampling the inductive current of each PFC; the hardware circuit of a main controller realizes power factor correction; and the hardware circuit realizes flow-equalization control. The invention also relates to a flow-equalization control unit comprising a plurality of current error control loops, and each parallel PFC circuit corresponds to one current error control loop. Each current error control loop comprises an operation link, a control link and a duty ratio regulation link, wherein the operation link realizes current operation and difference operation; in the control link, a current error signal is regulated; in the duty ratio regulation link, a main modulation signal is regulated to generate multiple paths of PWM (Pulse-Width Modulation) signals.

The invention relates to a double-wing type insect-like air vehicle, belonging to the technical field of micro air vehicles. The double-wing type insect-like air vehicle comprises four wings, permanent magnets, spiral coils, a control module, an air vehicle body, four carapaces, L-shaped chests and flexible hinges, wherein the permanent magnets and the spiral coils are corresponding to the four wings, and the L-shaped chests and the flexible hinges are corresponding to the four carapaces; the four wings are respectively bonded at the B ends of the four carapaces; the spiral coils and iron cores are bonded on the surface of the L-shaped chest along the D end; the four permanent magnets are respectively bonded on the surface of the carapaces opposite to the spiral coils and the iron cores; the axial lines of the permanent magnets, the iron cores and the spiral coils are coincident; the four L-shaped chests are fixedly arranged in the air vehicle body; the flexible hinges are respectively connected with the L-shaped chests and the carapaces; and the control module is installed at the center of the air vehicle body and is respectively connected with the four spiral coils. In the invention, each wing is directly driven by the electromagnetic force of an electromagnetic driver, thus each wing has simple structure and can be controlled conveniently and flexibly; the change frequency and the acting direction of the driving force can be changed by changing the frequency, the time sequence and the amplitude value of exciting pulse; and the main structure of the air vehicle is processed by adopting the MEMS technology, thus the miniaturization of the air vehicle can be realized easily.

A class D amplifier is provided that is capable of reducing distortion of a specific sampling frequency, and frequencies that are multiples of this frequency to a level where an LPF is not required and small-scale control circuit. Class D amplifier 100 is provided with H (full) bridge output section 120, output control section 110 that is configured with random number generator 103 that takes individual random numbers that do not depend on input values as output values, and PWM control signal generating circuit 104 that generates a final PWM control signal from the input values and output values of random number generator 103. Output control section 110 divides a pulse signal outputted at a reference point between sampling frequencies into a plurality of pulse signals with random widths that do not include the reference point, and outputs the pulse signals with random widths.

The invention discloses an electromagnetically-driven flapping wing type micro aircraft based on flexible hinges, which comprises chest cavities, cylindrical permanent magnets, a spiral coil, wings, a tergum and flexurally-deformed flexible hinges, wherein the two flexible hinges are passively twisted; the pair of wings is symmetrically mounted on both ends of the tergum; the flexible hinges are sandwiched between the two chest cavities to form a sandwich structure, the tergum is fixed on the flexible hinge, and both ends of the tergum are symmetrically positioned in free regions of the chest cavities; the spiral coil is fixedly mounted in the central position of the chest cavities; and the permanent magnet is fixed in the center of the tergum. Though the machining based on an MEMS (Micro Electronic Mechanical System) process, the invention realizes the flapping wing type micro aircraft of which the wingspan is smaller than 3cm, and driving force can be obtained through the interaction of the energized spiral coil and a magnetic field between the permanent magnets. Besides, the invention has the advantages of very simple structure, small input voltage and large output force, is convenient and flexible to control, and is easy to realize portable operation.

In an optical disk recording device for projecting a recording light beam onto an optical disk to form 3T-11T pits in a land of the optical disk, timing to sample and hold a reflected light detection signal for tracking servo control is delayed behind timing to sample and hold the reflected light detection signal for wobble signal detection. Further, a sample-and-hold time period of the reflected light detection signal for tracking servo control is set to be shorter than a sample-and-hold time period of the reflected light detection signal for wobble signal detection. Such arrangements permit appropriate recording, even at high recording speeds, irrespective of residual optical axis deviations.