817results about How to "Avoid power loss" patented technology

The invention discloses a charge control method and system for a low-voltage storage battery of an electric automobile, and a vehicle control unit and relates to the technical field of electric automobile vehicle control. The charge control method comprises the steps that after the electric automobile is started, the vehicle control unit controls a DC/DC convertor to start, and the low-voltage storage battery is precharged; after the low-voltage storage battery is precharged, the vehicle control unit controls the DC/DC convertor to stop, and voltage of the low-voltage storage battery is monitored; the vehicle control unit determines the battery state of the low-voltage storage battery according to the monitored voltage of the low-voltage storage battery; and according to the battery state of the low-voltage storage battery and/or the current operating state of the electric automobile, the DC/DC convertor is controlled to start or stop, and intermittent charge for the low-voltage storage battery is achieved. Through charge control over the low-voltage storage battery, the energy utilization ratio of the electric automobile is increased, and the service life of the low-voltage storage battery is prolonged.

An accumulation conveyor system for supporting and moving a plurality of objects. The conveyor system is divided into a plurality of zones wherein each zone includes a top and bottom conveying surface and wherein a space is defined between the top and bottom surfaces. Each zone also includes its own motor positioned external to the space between the conveying surfaces and coupled to the conveying surfaces via a non-slip connection. A control system is connected to the motor and controls the power to the motor so that the conveying surfaces in each zone can be moved independently. Whenever a sensor detects an empty downstream zone, it signals the control system of the upstream zone to power the motor and move the object to fill the empty zone. The control system may also be configured to allow a soft start wherein motor speed is increased gradually.

The invention relates to the data safety transmission technology, and discloses a configuration method of smart home network nodes and data transmitting and receiving methods. In the invention, long-term secret keys are distributed to the nodes of a smart home network, and encryption and decryption are performed on data information (INFO) through adoption of the long-term secret key (KEY) in the data transmission process, so data safety transmitting and receiving are achieved, a data packet is prevented from being intercepted, counterfeited and falsely issued, and safety of data interactions performed by the smart home network and a terminal is guaranteed.

The invention relates to a method and a system for randomly switching alternating current. The system comprises a voltage detecting circuit, a current detecting circuit, a first switching circuit, a second switching circuit, a control circuit, a pulse width modulator (PWM) and an APFC circuit, wherein the first switching circuit is used for switching on or off a main power supply; the second switching circuit is used for switching on or off a reserve power supply; the control circuit is used for controlling the first switching circuit and the second switching circuit to switch on or off and transmitting a pulse signal to the PWM; the PWM is used for modulating an output dutyfactor according to the pulse signal transmitted by the control circuit; the APFC circuit is used for receiving the output dutyfactor of the PMW so as to control the output current, and thereby the linear rectification of the output current is realized to ensure the synchronization of the output voltage and the current phase of the APFC circuit. The state of the power supply can be automatically recognized by adopting the random switching so as to adapt to power supplies in different environments, and the switching time is greatly reduced and fixed. The current linear rectification can be randomly switched as alternating current to solve the peak interference brought by the random switching, and the power compensation is carried out to realize the minimum loss of circuit power.

The invention discloses a voltage regulation method based on inverter power coordination control. The method comprises the steps that during one sampling period, a constrained and optimized mathematical model is used for conducting power coordination control over photovoltaic inverters; the objective function (shown in the specification) of the constrained and optimized mathematical model is the minimum of the sum of reactive power output by all photovoltaic power sources, and the constraint conditions include the inverter capacity constraint, the node flow constraint, the node voltage constraint and the inverter power adjustment weight constraint; on the condition of meeting all the proposed constraint conditions, a set of reactive power adjustment quantities of the minimum sum of the reactive power output by all the photovoltaic power sources are solved through an optimization algorithm and serve as reactive power reference values for coordination control over all the photovoltaic inverters, and voltage adjustment of grid-connection points in an area is achieved. By means of the method, on the premise of not reducing the photovoltaic output active power, the voltage adjustment capacity of each inverter can be fully utilized, and the situation that unnecessary lien power losses are caused by output of excessive reactive power can be avoided.

A circuit is disclosed for determining which of a multiplicity of LED strings in an illumination system has a fault. A group of circuits determines the maximum, minimum, midpoint between maximum and minimum, and average voltage of the group of LED string voltages in use, and examines the statistical properties of the LED string voltages. Comparators are used to find the strings which have the highest and lowest operating voltages, and to compare the midpoint and average voltages to determine whether the highest or lowest voltage string is responsible for causing a fault in the illumination system operation. Memory means are used to keep the said determined string turned off to prevent faulty operation.

The invention provides a parameter design method for a high-voltage high-capacity VSC (voltage source converter). The VSC is connected with an electric grid through an LCL (lower control limit) filter, the LCL filter comprises an electric grid side electric reactor, a valve side reactor and a filter capacitor, and the filter capacitor is connected in parallel between the valve side reactor and the electric grid side electric reactor. The problems for filtering out harmonic waves filled into the electric grid by the VSC and inhibiting the converter main loop resonance led in by the LCL filter are solved through setting the parameters of the LCL filter and a controller of the VSC. Compared with the simple experience algorithm and the complicated calculating method of the existing LCL filter, the method has the advantages that the parameter of the filter is designed according to the operation characteristics of the VSC and the frequency-domain characteristics of the LCL filter, simplicity is realized, the implementation is easy, the engineering construction can be realized, the theoretical basis is full, the harmonic pollution to the electric grid is low, and the grid-connected electric energy quality requirement of the national standard on the VSC can be met.

The present invention relates to a multi-mode wireless power transmission method and a device for the same. A wireless power transmitter for supporting a plurality of wireless power transmission modes, according to one embodiment of the present invention, can comprise: a first transmitter for transmitting a first power signal corresponding to a first wireless power transmission mode; a second transmitter for transmitting a second power signal corresponding to a second wireless power transmission mode; and a first power cutoff circuit coupled to the first transmitter so as to block the incoming second power signal and allow the first power signal to pass therethrough. Therefore, the present invention can minimize power consumption in the wireless power transmitter supporting the plurality of wireless power transmission modes, and can maximize power transmission efficiency.

The invention provides a mobile communication base station transceiver employing a software radio technology which is applied to a mobile communication system based on a time division (TD)/ frequency division multiple address (FDMA) technology. The transceiver comprises three components, namely a multi-mode control device, radio frequency front end and a digital signal processing device. The invention also provides a method for realizing the transceiver. The invention flexibly adapts to receiving and transmission of the signals from single carrier base station to multiple carrier base station, and supports multichannel diversity receiving; due to the adoption of a wideband transmitter, the invention flexibly adapts to emission of multiple carriers with irregularly distributed frequency and also avoid power loss when the multiple carriers are combined; by adoption of multiple narrow band radio frequency receiving channels, the invention can meet requirements for high dynamic and high blocking resistance performance of signal receiving; and by the invention, the mobile communication base station which has low power consumption, small size, high performance and flexible configuration can be realized.

The invention relates to an automobile starting and stopping protective system and method. The automobile starting and stopping protective system comprises a storage battery, an electric quantity sensor and an automobile body controller which is connected with a CAN bus. The electric quantity sensor is arranged at the output end of the storage battery, is used for detecting the discharge current of the storage battery and is connected with the communication end of the automobile body controller through a LIN bus. When an ignition lock ON gear switch is disconnected, the automobile body controller sends a network dormant message through the CAN bus, so that idle electronic equipment connected with the CAN bus enters the dormant state, and the automobile body controller enters the dormant state after the discharge current of the storage battery is smaller than a first threshold value. After the automobile body controller enters the dormant state, if the discharge current of the storage battery is larger than a second threshold value, constant electricity output by the storage battery is controlled to be disconnected in the set time, and a forced outage message and a failure warning message are sent through the CAN bus. Through the automobile starting and stopping protective system and method, the safety of an automobile can be improved, and the energy consumption of the automobile is reduced.

The invention provides a seat heating control method for an automobile. The method comprises the following steps: receiving a seat heating signal, and judging whether a seat heating condition is satisfied or not after the seat heating signal is received; if the seat heating condition is satisfied, further detecting whether a person exists on a seat or not; if the person is detected on the seat, heating the seat. By adopting the seat heating control method for the automobile according to the embodiment of the invention, a seat heating function can be prevented from being started under a proper climate condition; meanwhile, the heating function is prevented from being started due to error operation of a user. Moreover, active power supply management can be realized through the method, and the occurrence of power shortage of a vehicle-mounted storage battery (whole storage battery) is avoided, thereby avoiding damage to the vehicle-mounted storage battery. In the absence of passengers, the seat heating function is automatically stopped in order to reduce power consumption. The invention further provides a seat heating control system for the automobile and the automobile.

The invention discloses an escalator safety system which comprises a monitoring relay, a processing module, a laser emitter and a laser receiver. The output end of the monitoring relay is connected into an escalator operation loop. The processing module controls the monitoring relay to be closed and opened. The laser emitter is provided with a laser emitting opening and arranged at the high end of an escalator and the emitting opening faces the low end of the escalator or the laser emitter is arranged at the low end of the escalator and the emitting opening faces the high end of the escalator. The laser receiver receives laser from the laser emitter and is in signal connection with the processing module. The laser receiver and the laser emitter which are matched are arranged at the high end and the low end of the escalator respectively. The laser emitter and the laser receiver are arranged in a well of the escalator. According to the escalator safety system, the problem that power is consumed due to the fact that infrared detectors are arranged densely or response is not in time due to the fact that infrared detectors are arranged sparsely is solved, one induction line can monitor multiple stairs at the same time, the detectors can achieve feedback immediately once the stairs fall down, the number of required detectors is small, and power consumption is low.

The invention provides a dual-network-segment controlling method and system. The method comprises: after the power of an overall vehicle is off, an ESC collects a current vehicle speed and a gateway collects a state of a vehicle body CAN bus; the ESC sends a power CAN message including current vehicle speed information to the gateway by a power CAN bus; if the vehicle body CAN bus does not enter a sleep state, the gateway converts the power CAN message into a vehicle body CAN message and sends the vehicle body CAN message to a PEPS by the vehicle body CAN bus; the PEPS determines whether the vehicle speed information in the vehicle body CAN message is zero; if so, a steering wheel delocking operation is executed; and if the vehicle body CAN bus enters a sleeping state, the gateway sends information of stopping sending of the power CAN message including the current vehicle speed to the ESC by the power CAN bus. Therefore, a problem of unnecessary storage battery power consumption due to data sending by the ESC to the vehicle body CAN bus in a sleeping mode in the prior art can be solved.

The invention discloses a local dormancy awakening method for a CAN bus star network management architecture scheme. The method comprises the following steps that a CAN network management message anda plurality of controllers corresponding to multiple operations are provided, wherein the CAN network management message is based on an OESK network management message format and is provided with a destination address (DA) and a network management state bit CF; and when a vehicle executes the operation, only the controller related to the operation is awakened by the CAN network management message,and the controller unrelated to the operation is not awakened and is still in a dormant state in order to reduce the number of the awakened controllers. According to the method, the number of the awakened controllers is reduced to the minimum value through the local network dormant awakening, and the lack of electricity of a storage battery is effectively prevented.

An assembly includes an analog signal processing unit. An analog signal path and an amplifier an automatic gain control unit are coupled to the signal path. Further to the output of the amplified analog signal, a gain information is provided as an analog or digital signal at a gain information output. This information can be used for further processing the signal, e.g., by automatic noise compression or to control further signal processing units.