106results about How to "Save PCB area" patented technology

The invention discloses a multi-line scanning high-refresh-rate full-color LED driving chip and a driving method, and belongs to the field of full-color LED driving chip design. The multi-line scanning high-refresh-rate full-color LED driving chip comprises a synchronous controller, a shift register, a state register, an SRAM buffer, a gray clock generation module, a driving module, a pre-charging circuit and an analog output module. The gray scale clock generation module is used for carrying out frequency multiplication/frequency division processing on the data clock signal DCLK according to the instruction information so as to generate a gray scale clock signal GCLK for controlling the gray scale. The driving module is used for counting the gray scale clock signal GCLK to obtain gray scale counting corresponding to each row of pixel data, and generating an output waveform of a PWM signal corresponding to each row of pixel data by using N continuous rows of pixel data and the corresponding gray scale counting in each scanning process, so that multi-row scanning is realized. The analog output module is used for receiving the PWM signal and generating constant current to drive the LED lamp bead in cooperation with the pre-charging circuit. According to the chip, the refresh rate can be improved, and more scanning lines can be supported.

The invention provides a radio frequency LPA Mid device, a radio frequency transceiving system and communication equipment, the radio frequency LPA Mid device is configured with a first low frequencytransmitting port and at least one receiving port used for connecting a radio frequency transceiver and four alternate transmitting ports used for connecting an antenna, the radio frequency LPA Mid device comprises a transmitting circuit connected with the first low frequency transmitting port, and is used for amplifying a plurality of low-frequency-band signals received by a first low-frequency transmitting port; a receiving circuit which is connected with the plurality of receiving ports and is used for amplifying the plurality of low-frequency-band signals received by the wheel emission port and outputting the amplified signals to the receiving ports; and switching circuits which are correspondingly connected with the transmitting circuit, the receiving circuit and the four alternate transmitting ports and are used for selectively conducting the radio frequency path between the transmitting circuit and any alternate transmitting port so as to support alternate transmission of any low-frequency-band signal among the four alternate transmitting ports, so that the integration degree of the radio frequency device can be improved, and the area is saved.

The invention comprises a shaping circuit, a CPLD logic controller, a pulse modulation amplification circuit, an isolating transformer, a pulse demodulation circuit and an output amplification circuit. The inputted signals are translated into the square wave through the shaping circuit, and then are inputted into the CPLD logic controller to make logic process; after outputting, the signals pass through the modulation amplification circuit to generate the sharp pulse signals that are coupled to the sublevel through the isolating transformer and reduced to PWM signals through the demodulation circuit; finally, driving the IGBT through the output amplification circuit.

The invention relates to a method for accurately controlling water feed of a soybean milk machine. The method includes at least one step of correcting water pumping speed, according to the step, water is injected to a comminuter with small space through a water pump, when the injected water reaches a water level sensor, the water level sensor feeds back a signal to a circuit control unit to stop work of the water pump, the circuit control unit records working time of the water pump, the nominal water volume is divided by the working time of the water pump, therefore, the circuit control unit obtains and stores water pumping speed, and then water pumping time is adjusted according to the stored water pumping speed to accurately control the water injection rate. Under the condition that related structures, such as the water pump and a water pipe, of the existing soybean milk machine are fixed already, the nominal water volume is divided by the working time of the water pump to obtain the accurate water pumping speed, and the water pumping time is adjusted timely according to the calculated water pumping speed, so that the water feed is controlled accurately, and better soybean milk can be prepared in the later-period soybean milk making process.

The invention relates to a lithium battery protection chip of an integrated power metal oxide semiconductor field effect transistor (MOSFET). The lithium battery protection chip is provided with six pins as follows: a positive power input end VDD, a negative power input end VSS (GND), an overcurrent detection input end/charger detection end CS, a battery core negative electrode end S1, a charging negative electrode end S2 and a power MOSFET drain common end D. The chip comprises a logic controller, an over-charging current comparator, an over-discharging voltage comparator, a short-circuit comparator, a first over-discharging current comparator, a second over-discharging current comparator, a power reset module, an oscillator module, a bandgap reference circuit, a voltage divider, a discharging overcurrent detection module, an MOSFET for charging control and an MOSFET for discharging control. The chip disclosed by the invention has protective functions of over-charging, over-discharging, overcurrent, short-circuit and the like, and the working power consumption is very low; and moreover, the area of a printed circuit board (PCB) of the chip is substantially reduced, and the chip is very suitable for various information product occasions which are very small in space limitation and require a rechargeable lithium battery to supply power for a long time. The chip adopts a small-sized package mode of DFN-5L, the chip area is further reduced, and thus, the chip cost is reduced.

The invention provides a radio frequency transceiver, an electronic device and a method for adjusting a work frequency band. The radio frequency transceiver comprises an antenna with an adjustable frequency, a transceiver, and a radio frequency front-end circuit which has an adjustable frequency and is connected between the antenna and the transceiver, wherein the transceiver is used for generating an uplink radio frequency signal based on a current network mode and/or a current frequency band; the network mode and the frequency of both the antenna and the radio frequency front-end circuit can be adjusted into the current network mode and/or the current frequency band; the uplink radio frequency signal after being processed by the radio frequency front-end circuit is transmitted out through the antenna; the antenna is also used for obtaining a downlink radio frequency signal; the downlink radio frequency signal after being processed by the radio frequency front-end circuit reaches to the transceiver; and the transceiver is also used for processing the downlink radio frequency signal.

The invention discloses a device and method for eliminating local oscillator leakage and relates to the technical field of mobile communication. The device comprises a coupler for carrying out local oscillator leakage signal extraction processing on an up-conversion signal or a down-conversion signal output by a frequency mixer to obtain a local oscillator leakage signal; an amplitude detection and adjustment module used for carrying out amplitude adjustment on the local oscillator signal according to the amplitude of the local oscillator leakage signal to obtain a local oscillator leakage amplitude offset signal equal in amplitude with the local oscillator leakage signal; and a phase detection and adjustment module used for carrying out phase adjustment on the local oscillator leakage amplitude offset signal according to the phase of the local oscillator leakage signal to obtain a local oscillator leakage offset signal equal in amplitude but opposite in phase with the local oscillatorleakage signal.

The invention discloses a clock management system in a uTCA system and a method thereof. The system comprises a clock management device and an SERDES clock generation unit, wherein, the clock management device comprises a reference source clock selection unit, a clock source generation unit and a clock source drive unit, the reference source clock selection unit selects a clock source from a plurality of received clock sources as a reference clock source; the clock source generation unit generates a clock source synchronous with the reference clock source according to the received reference clock source; the clock source drive unit carries out level translation on the clock source received from the clock generation unit, and transmits the clock source to the SERDES clock generation unit; and the SERDES clock generation unit carries out frequency conversion on the clock source received from the clock source drive unit, and generates desired SERDES clock. The system and the method help reduce the realization difficulty of hardware circuits, PCB area of MCH units and the cost.

The invention discloses a high-power high-stability variable-load high-frequency acceleration system. The high-power high-stability variable-load high-frequency acceleration system comprises a low-level high-frequency controller, a power amplification and transmission system and a high-frequency cavity; the power amplification and transmission system comprises a high-frequency machine, a transmission line and a coupling window; the low-level high-frequency controller is responsible for generating low-level high-frequency signals with appropriate values, and driving the high-frequency machine by the generated low-level high-frequency signals; the high-frequency machine is responsible for amplifying the low-power high-frequency signals into high-power high-frequency electromagnetic waves, and then transmitting the electromagnetic waves to the coupling window through the transmission line; the coupling window is used for coupling high-frequency power from the amplification system to the high-frequency cavity, and is characterized in that the coupling window is a dynamic adjustable coupling window; the high-frequency cavity is of a runway cavity structure; the invention further discloses an automatic adjustment coupling degree algorithm of the high-power high-stability variable-load high-frequency acceleration system, wherein the algorithm comprises the steps that a dynamic reflection power adjustment coupling degree algorithm is initialized; and the final calculation formula of the dynamic reflection power adjustment coupling degree is obtained.

The invention discloses a power supply and electrical equipment. The power supply is composed of an LLC control circuit, an input rectification circuit, a switch circuit, and an LLC transformer. The LLC transformer includes an EQ type transformer and a leakage inductor arranged outside the EQ type transformer. The input rectification circuit rectifies inputted commercial power into a direct current. The LLC control circuit controls connection or disconnection of a switch module, so that the direct current outputted by the input rectification circuit is converted into a pulsating direct current that is then transmitted to the LLC transformer. The LLC transformer carries out voltage conversion on the inputted pulsating direct current inputted and then outputs the processed current to a load. According to the technical scheme, the power conversion efficiency is improved; and the power occupied space is reduced.

The invention discloses a flasher chip, which comprise a CEXT capacitor charging module, an oscillator, a counter module, a power voltage detection circuit, a light load detection circuit, a logical control circuit, an over-temperature protection circuit, a current limiting circuit, a power tube driving circuit and a power tube. The frequency of the flasher chip is controlled by an internal circuit and is irrelevant to an external capacitor; moreover, the control accuracy of the frequency is high, peripheral elements can be reduced, the area of a PCB (Printed Circuit Board) is small, and the functions of light load automatic detection, over-temperature protection and the like are realized.

The invention discloses a TEC temperature control driving circuit which is characterized in that the circuit comprises a linear regulator LDO, a current absorbing circuit and a switching power supply SW circuit. The output end of the linear regulator LDO is connected with the LDO terminal of a TEC to provide input voltage V-LDO. The output end of the switching power supply SW circuit is connected with the SW end of the TEC to provide input voltage V-SW. According to the current absorbing circuit, when V-LDO is greater than V-SW, disconnection is carried out, and current flows from the linear regulator LDO into the TEC; when V-LDO is less than V-SW, breakover is carried out, and current flows from the TEC to the current absorbing circuit. According to the invention, a new LDO+SW topology circuit structure is designed, and the advantages of small LDO ripple and high SW efficiency are combined; the current absorbing circuit is added on the LDO terminal, so that the LDO terminal can output current and absorb current; and the same circuit is used to drive the TEC to carry out heating or refrigeration.

The invention relates to the field of touch keys, and discloses a resistor type touch key device and a method for realizing the resistor type touch key. The method comprises the following steps: A, extending coordinate electrodes at two ends of two conductive layers of a resistor type touch screen to form key electrodes; and B, distributing the key electrodes on positions corresponding to an upper circuit layer and a lower circuit layer, and adding an insulating point layer between the upper circuit layer and the lower circuit layer. A low-cost resistor type touch key is realized by extendingthe electrodes (generally silver pulp lines) of the conductive layer of the resistor type touch screen and using the principle of resistor type touch control. By adopting the device and the method, the interference resistance can be effectively improved, and because the conventional resources are used, components and parts are reduced, the PCB area is reduced, and cost is saved.