1216results about How to "Reduce operating frequency" patented technology

The present invention discloses a high efficiency constant current LED driver, which comprises a rectification bridge, a PFC main circuit, an isolated DC / DC converter, a PFC controller and a PFC bus control circuit. Since the input voltage is an intermediate PFC bus voltage, which varies with the output voltage of the DC / DC converter. When the isolated DC / DC converter is an LLC resonant circuit, the operating frequency of the LLC circuit is close to the resonant frequency within a wide output voltage range. Thus, the gain range and the operating frequency is narrow, and can enable the constant current module to work with a high efficiency at a wide output voltage range. When the isolated DC / DC converter is a symmetric half bridge, or an asymmetric half bridge or a full bridge circuit, the duty cycle of DC / DC circuit is close to 50% within a wide output voltage range. Thus, the changing range of the duty cycle of the DC / DC converter will be narrow and can improve the efficiency dramatically.

The present invention relates to a system and a method of measuring a physiological variable in a body. A basic idea of the present invention is to measure a physiological variable in a body by means of employing a sensor (314) which is arranged to be disposed in the body for measuring the physiological variable. The sensor must be provided with a supply voltage in order to be operable. Therefore, a control unit (322) disposed outside the body provides this supply voltage to the sensor. The control unit also receives, from the sensor, via a wired connection (311), signals that represent the physiological variables that are measured. The control unit is arranged with a communication interface (401, 701) and a modulator (301) for wireless communication of the measured physiological variables for presentation purposes.

Different algorithms are used in H.264 / AVC intra coding to form three coding levels. Algorithms used in two of the three coding levels reduce calculation complexities and power consumptions. The basic level is an exception, which fully keeps an original picture quality. Thus, various needs can be met by coding in the various levels with the various algorithms.

A memory system is provided that increases the overall bandwidth of a memory channel by operating the memory channel at a independent frequency. The memory system comprises a memory hub device integrated in a memory module. The memory hub device comprises a command queue that receives a memory access command from an external memory controller via a memory channel at a first operating frequency. The memory system also comprises a memory hub controller integrated in the memory hub device. The memory hub controller reads the memory access command from the command queue at a second operating frequency. By receiving the memory access command at the first operating frequency and reading the memory access command at the second operating frequency an asynchronous boundary is implemented. Using the asynchronous boundary, the memory channel operates at a maximum designed operating bandwidth, which is independent of the second operating frequency.

A memory system is provided that reduces latency by running a memory channel fully asynchronous from a memory device frequency. The memory system comprises a memory hub device integrated in a memory module. The memory hub device comprises a command queue that receives a memory access command from an external memory controller via a memory channel at a first operating frequency. The memory system also comprises a memory hub controller integrated in the memory hub device. The memory hub controller reads the memory access command from the command queue at a second operating frequency. By receiving the memory access command at the first operating frequency and reading the memory access command at the second operating frequency an asynchronous boundary is implemented. The first operating frequency is a maximum designed operating frequency of the memory channel and the first operating frequency is independent of the second operating frequency.

An instantaneous current and instantaneous voltage of a three-phase coil of a brushless DC motor are detected, and the internal condition of a compressor is predicted from these detection values. The prediction about the internal condition of the compressor is made in such a way that motor driving torque which is a parameter of a motor model is identified and poor lubrication, liquid compression or the like is predicted from this identified motor driving torque. This enables it to make, in real time, a failure forecast, failure diagnosis etc. on the compressor.

A control unit for an electric oil pump of the present invention includes: a one-way valve that permits circulation of operating fluid from the electric oil pump to the friction engagement device and blocks circulation in the opposite direction; an accumulator that is connected to a fluid supply path joining the one-way valve to the friction engagement device and accumulates hydraulic pressure required for operating the friction engagement device; a hydraulic pressure measuring device that measures hydraulic pressure inside the fluid supply path; a vehicle speed measuring device that measures a vehicle speed of the vehicle; and a pressure setting device that sets a first predetermined pressure based on the vehicle speed measured by the vehicle speed measuring device.

A method and system for reducing the frequency of operation for a transversal Finite Impulse Response (FIR) filter is disclosed. In the preferred embodiment, the transversal filter operates in such a way that it has an even and odd row of data, which are latched on rising and falling edges of the clock respectively. This allows the clock frequency to be reduced by a factor of 2, and thus allows the use of more power efficient latches. A reduction in the frequency of operation causes the high speed latches within the transversal filter to hold the data bits twice as long as is required, which changes the desired impulse response of the FIR filter. A circuit is required to select the appropriate data bits from the output of the appropriate half-speed latch, and subsequently scale it to apply the co-efficient gain. Each of the subsystems is analog, and operates in accordance with a synchronous clock system. In a more general embodiment of the invention, the data is provided to Q shift registers that operate at a clock rate which is reduced by a factor of Q.

A method of controlling power consumption in an electronic device may include selecting between an on mode of the electronic device in which first circuitry of the electronic device is configured to perform a first operation, an off / standby mode in which second circuitry of the electronic device is configured to perform a second operation, and a sleep / vacation mode in which the second circuitry is controlled to at least one of reduce a frequency of and suspend performance of the second operation. An electronic device may include: first circuitry configured to perform a first operation when the electronic device is in an on mode; second circuitry configured to perform a second operation when in an off / standby mode; and a circuitry controller configured to control the second circuitry to at least one of reduce a frequency of and suspend performance of the second operation when in a sleep / vacation mode.

The invention provides an air conditioner control method and device for preventing condensation water dripping and an air conditioner. The air conditioner control method for preventing condensation water dripping comprises the following steps: measuring first indoor humidity after detecting that a current running mode of the air conditioner is a refrigeration mode or a dehumidifying mode; measuring second indoor humidity after the air conditioner runs for a first preset time in the current running mode; calculating humidity difference between the first humidity and the second humidity; and judging whether the current running mode of the air conditioner is changed or not according to the humidity difference and the second humidity. Whether the risk of condensation exists or not when the air conditioner continues running can be known according to the humidity difference and the second humidity, therefore, whether the current running mode of the air conditioner is changed or not can be judged, and the purpose of preventing condensation is achieved by changing the current running mode of the air conditioner.

A phased array antenna includes a substrate, and an array of dipole antenna elements on the substrate. Each dipole antenna element comprises a medial feed portion, and a pair of legs extending outwardly therefrom, and adjacent legs of adjacent dipole antenna elements include respective spaced apart end portions. A respective impedance element is electrically connected between the spaced apart end portions of adjacent legs of adjacent dipole antenna elements for providing increased capacitive coupling therebetween.

The present invention relates to a display, a timing controller and a data driver for transmitting a serialized multi-level data signal, and more particularly to a display, a timing controller and a data driver for transmitting a serialized multi-level data signal for reducing the number of wirings between the timing controller and the data driver, and for reducing an EMI component. The display of the present invention comprises a display panel, a scan driver, a timing controller and a plurality of data drivers, wherein the timing controller transmits a transmission signal including a serialized data signal to one of the plurality of the data drivers, wherein a level of the data signal is selected from at least four different levels according to a value of a data having a length of at least two bits, and wherein the data driver restores the data from the transmitted transmission signal.

A power conversion circuit improves lamp operating life and lamp efficiency by driving a fluorescent lamp with a square wave signal. The square wave signal is an alternating current signal with relatively fast transition times. The square wave signal advantageously reduces lamp current crest factor for more efficient operation of the fluorescent lamp.

A microstructure has a substrate, a fixed electrode having a plurality of fixed fingers fixed to the substrate, a movable electrode having a body (28) and a plurality of fingers (22) extending from the body, the movable electrode being movable relative to the fixed fingers to vary a capacitance of the electrodes. The fixed fingers (21) extend in a first plane parallel to a main surface of the substrate, wherein the body of the movable electrode extends in a second plane adjacent to the first plane so that the body faces at least some of the plurality of fixed fingers. Such vertical integration can help enable such devices to be made more compact.

A system for protecting against overheating of a CPU whose operation frequency is changed due to voltage variation of a driving power, includes a CPU temperature sensor to detect the temperature of the CPU, a reference temperature sensor to detect the temperature of a circuit block or multiple circuits heated due to the operation frequency of the CPU, a comparing part to output a signal indicating a higher temperature of the temperature of the CPU and the temperature of the circuit block or multiple circuits by comparing temperature values detected by the respective CPU and reference temperature sensors, and a CPU power supply to supply a stepwise decreasing driving power to decrease the operation frequency of the CPU in a stepwise fashion when the temperature value increases based on the signal indicating the higher temperature indicated by the comparing part. Thus, a system for protecting against overheating of a CPU enables only one overheating-protection circuit to solve the problem of overheating of multiple circuits that are easily heated due to the frequency of operation of the CPU, thus maximizing the operation efficiency of the CPU and also efficiently protecting the CPU from damage.

A bus controller includes: a data receiving section for receiving output status information from other bus controllers on transmission routes available; a route load detecting section for calculating uniformity of distribution index indicating the degree of non-uniformity in transmission flow rate between the routes based on the output status information; a routing section for determining transmission routes, of which the transmission flow rates have been adjusted by reference to the index; a packet assembling section for generating a packet; a data output section for outputting the packet through one of output ports; a header analyzing section for determining which output port is connected to a transmission route chosen by reference to information about the packet receiving end; and a data output section for outputting the packet through the output port.

A power conversion circuit improves lamp operating life and lamp efficiency by driving a fluorescent lamp with a square wave signal. The square wave signal is an alternating current signal with relatively fast transition times. The square wave signal advantageously reduces lamp current crest factor for more efficient operation of the fluorescent lamp.

The invention provides a method and a system for controlling low-speed worming. The method includes that a vehicle control unit (VCU) collects current vehicle state signal and sends the same to a motor control unit (MCU); the MCU determines current working mode by controlling target rotating speed of a motor according to the current vehicle state signal; the VCU controls rotating speed and working mode of the motor by detecting braking pedal signal, acceleration pedal signal, gear position signal and actual motor rotating speed signal fed back by the motor of a vehicle, and the MCU controls the motor to realize control on low-speed worming of the vehicle.

A hybrid automobile, wherein a second power source operated with less frequency can be forcibly operated. The hybrid automobile comprises a storage battery as a first power source. The hybrid automobile further comprises an engine and a motor generator or a fuel cell as the second power source. When the hybrid automobile is run by the first power source, a driver can change over an operation mode to a running by the second power source by operating an input device. The hybrid automobile further comprises a notification means for prompting the driver to operate the input device when the non-operating time of the second power source exceeds a predetermined time or longer. Furthermore, the hybrid automobile comprise a control means which, when the remaining amount of energy of the second power source is less than a predetermined amount, stops the changeover of the operation mode from a running by the first power source to the running by the second power source.

The invention discloses a system for modulating the work frequency of a switch power converter. The system comprises an oscillator for receiving an input signal which represents the load situation of a switch power; the oscillator at least generates one first output signal, one cycle of which consists of three parts, namely a first time period, a second time period and a third time period; the first output signal boosts up during the first time period and the second time period, but falls during the third time period; wherein, the length of the second time period changes between zero and a maximum value preset along with the change of the input signal and the length of the input signal and the length of the second time period are inversely proportional. The second time period is modulated by a feedback signal so as to cause the work frequency of the switch power converter to be reduced when the switch power is under the conditions of light load and zero load, thus reducing power loss. The system of the invention can be widely applied to the switch power modulated by PWM.

The embodiment of the invention provides a control method and device for delaying frosting of an air-conditioner and an air-conditioner. According to the method, low pressure and outdoor evaporator inlet temperature are obtained every preset time intervals; according to the obtained low pressure and the outdoor evaporator inlet temperature, whether the air-conditioner frosts or not is determined;and when the air-conditioner frosts, whether a compressor has enough reliability or not is determined according to the exhausting superheat degree. When the compressor has the enough reliability, thecompressor is controlled to reduce the working frequency, meanwhile, the opening degree of an expansion valve is increased to prevent frosting from aggravating, an outdoor fan does not need to reverseand defrost, while it is ensured that the exhausting superheat degree is enough, the reliability of a pressing machine is not influenced, frosting is prevented from aggravating more and more, and useexperience of users is improved.

The invention discloses a driving method of a display panel. The display panel comprises a plurality of pixel groups, wherein each pixel group comprises two pixel units arranged adjacently along a first direction; each pixel unit comprises sub-pixels arranged adjacently along a first direction; and a driving method of the display panel comprises the following steps: applying a driving voltage with opposite polarity to the two pixel units in the same pixel group; applying a driving voltage with opposite polarity to two adjacent pixel units; applying a driving voltage with same polarity to the sub-pixels in the same pixel unit; and separately applying a driving voltage with different voltage grades to the sub-pixels in two adjacent pixel units. The invention also discloses a driving apparatus of the display panel and a display apparatus. By adopting the display method of the display panel, the driving apparatus of the display panel and the display apparatus, the display effect of the display panel can be improved.

The data to be calculated for the CRC code are divided to multiple data blocks with each length being as Ls digits. Each data block is input into (1,...N-1) channels. The CRC calculation is carried out for the data in each channel of the N channels so as to obtain CRC sub-code (r1, r2,...rN). The transformed CRC sub-code (R1, R2,...Rn-1) of the CRC sub-code (r1, r2,...rN) is obtained by through the lookup table of the division residue transformation. Finally, the exclusive or calculation is carried out for the CRC sub-code (R1, R2,...RN-1). Then the exclusive or calculation is carried out between the result at previous step and rN so as to obtain the CRC code of entire data to be calculated. The invention has the advantages of fast calculation speed and easy of implementation, being applicable to the CRC calculation for 10G Ethernet and 40 Gbps SDH high-speed network.

The invention discloses a four-footed walking robot platform which is provided with a driving power via cam rigidity by an internal-combustion engine and is provided with a swerving power by a servo motor system and the balanced stance of which is regulated. A compound driving mode is established by finding a high efficient walking mode of combining the power technique of current car, tank and tractor with the technique of modern computer and robot technique based on the research result of the current multi-footed robot. 99% of driving power for the robot straightly walking on flat road is provided by the internal-combustion engine. When rugged road appears or the robot needs to swerve, the motor system regulates the balanced stance and finishes the swerving task. The robot of the invention not only can decrease the power of the motor system, lighten the self-weight, lower the use frequency of the motor system and prolong the service life of a screw rod, but also can completely imitate the four-footed animals, can realize continuous, smooth, stable, powerful and efficient walking and can continuously work for a long time in a complex environment.

A switching mode power supply (SMPS) includes a power transistor coupled to the primary winding of transformer and a resistor coupled between the input power source and a control terminal of the power transistor for triggering a primary current flow through the power transistor for providing startup power. A primary side control circuit is configured to regulate the output of the SMPS. A secondary side control circuit is coupled to the secondary winding and being configured to provide a first electrical signal to the secondary winding when an output voltage of the SMPS is less than a first reference voltage, whereupon an awakening signal is induced in the auxiliary winding and causes the primary side control circuit to provide a turn-on signal to the power transistor. The primary side control circuit is configured to enter a standby mode or a normal operating mode in response to the awakening signal.

In bi-directional imaging, such as bi-directional printing, a galvanometric oscillator scans a light beam through a scan path across an imaging window. A controller enables transmission of video data to a modulator when the light beam is positioned for imaging on the imaging window. Video data is transmitted to the modulator when the light beam is traveling in a forward direction or a reverse direction across the imaging window, whereby a modulated light beam is capable of producing an image when traveling in the forward or reverse directions.

A method and for optimizing bit rate throughput in a digital communication system is provided. The method includes establishing a relationship between signal to noise ratio and plural symbol rates for a particular constellation size. The method also includes determining noise power spectral density (N(f)), wherein N(f) is determined during a silent period of line probing; determining Xk(f), wherein Xk(f) is determined by turning on a remote station transmit signal, after N(f) has been measured and determining residual echo Ek(f), wherein Ek(f) is determined by turning on a central station echo canceller.

A brake system for a vehicle includes an electrically operated parking brake drive device which generates an operating force for operating the wheel brakes or dedicated parking brakes in response to energization, and which operates even upon cancellation of the energization while in the operated state. A braking force related amount detector detects a physical quantity related to a braking force exhibited by each of the hydraulic pressure operated wheel brakes. When a detected physical quantity exceeds a reference value in a stopped state of the vehicle, a controller energizes the electrically operated parking brake drive device. Thus, the frequency of operation of the electrically operated parking brake drive device is decreased while eliminating inconvenient operations required to operate the electrically operated parking brake drive device, thereby reducing noise and improving durability.

In accordance with the described embodiments vehicular electronic control units and their operating methods are described which cost effectively compensate momentary external power loss by reducing the unit's power consumption while external power is lost. In an exemplary embodiment external power loss is detected by the electronic control unit's microprocessor. The microprocessor thereupon disables some components within the electronic control unit and operates with limited functionality for the duration of external power loss. The electronic control unit uses internal energy storage, e.g. a hold capacitor, to sustain its limited functionality operation. Upon recovery from the external power loss the electronic control unit resumes full operation.