93results about How to "Wide input range" patented technology

The invention discloses a multi-path data acquiring system based on FPGA, which mainly solves the problems of small signal acquiring range and poor acquiring precision of the prior multi-path acquiring system. The multi-path data acquiring system comprises a multi-path selector, a programmable-gain amplifier, an AD converter and an FPGA data processing module, wherein the FPGA data processing module sends an address signal to the multi-path selector and also sends a magnification signal to the programmable-gain amplifier; the multi-path selector selects an external analog signal according to the address signal to enter the programmable-gain amplifier; after amplifying the input analog signal, the programmable-gain amplifier outputs the analog signal to the AD converter; the AD converter samples the input analog signal, quantifies the analog signal to form a digital signal and transmits the digital signal to the FPGA data processing module; and the FPGA data processing module transmits the input data to a host computer after sequencing, wave filtering and table searching. The invention has the advantages of wide signal acquisition range, high precision can convenient acquisition path expansion, thereby being suitable for the signal acquisition of an industrial monitoring and sensing network.

The invention discloses a topological structure of a photovoltaic power station system based on bipolar direct-current transmission. The topological structure of the photovoltaic power station system based on bipolar direct-current transmission comprises a positive direct-current transmission line, a negative direct-current transmission line, two groups of photovoltaic inverters which are connected in parallel, and a boosting transformer, wherein each group of photovoltaic inverters comprises a Boost circuit, a direct-current bus, a three-phase bridge inverter and an alternating-current filter which are sequentially arranged along a direct-current transmission direction, and the output ends of the two groups of photovoltaic inverters are connected to the a boost transformer. The topological structure of the photovoltaic power station system based on bipolar direct-current transmission designed by the invention is capable of running simultaneously, and running singly and independently, thus the running reliability is enhanced, a high-power photovoltaic inverter is applicable, the power generation efficiency of a photovoltaic array is further increased, the input range of the direct-current voltage of the inverter is expanded, and the utilization rate of the direct-current voltage of the photovoltaic array is increased; two paths of output are connected with two three-phase windings of a grid-connected transformer, thus the switching frequency can be equivalently increased, and the harmonic waves of a grid-connected current can be reduced.

A gas concentration detecting apparatus comprises a gas concentration sensor and a gas concentration calculator. The sensor has first to third cells. A gas to be detected is introduced in a chamber and the first cell is responsible for discharging and changing oxygen from and into the chamber. The second cell detects a concentration of a specific gas component of the gas that has passed along the first cell. The third cell detects a concentration of residual oxygen in the gas that remains after discharge of the oxygen through the first cell. The calculator takes in a current acquired from the second cell measured with a voltage applied thereto and calculates the specific gas component concentration based on the current. The calculator includes plural concentration calculating means whose concentration detecting ranges are mutually different in a scale. The specific gas component concentration is calculated every concentration calculating means.

A differential circuit comprises first and second differential pairs driven by constant-current sources, respectively, for receiving input voltages, first transistors, second transistors, and switches are included. In a first connection state, one current mirror comprises among the first transistors. Input and output terminals of the one current mirror are connected to outputs of the first differential pair. Two current mirrors are composed by the second transistors. Inputs of the two current mirrors are connected to the outputs of the second differential pair, and the outputs of the two current mirrors are connected to an input and an output of the one current mirror circuit. The output of the one current mirror is a first output. In a second connection state, one current mirror comprises among the second transistors. The input and the output of the one current mirror are connected to the outputs of the second differential pair. Two current mirrors are composed by the first transistors. The inputs of the two current mirrors are connected to the outputs of the first differential pair, and the outputs of the two current mirror circuits are connected to the input and the output of the one current mirror circuit, respectively. The output terminal of the one current mirror is a second output terminal.

The invention relates to a password input method, which mainly comprises the following steps that: a mobile terminal is provided, wherein the mobile terminal has built-in service application, a graphics detection module, a graphics conversion module and a graphics input conversion table, and has a touch display screen; the service application is started, and the mobile terminal prompts a user to input a password; the user confirms the input of the password; the user draws graphics on the touch display screen, and the graphics detection module detects the graphics drawn by the user to form analysis elements; and the graphics detection module submits the analysis elements to the graphics conversion module, and the graphics conversion module maps the analysis elements to the preset graphics input conversion table to obtain a converted character sequence. In addition, the invention provides the mobile terminal using the method. By the password input method provided by the invention, an input way is simple, convenient, fast and favorable for user experiences, and the password setting security is improved.

The invention relates to a charging battery, in particular to a smart battery that is provided with a main battery and an auxiliary battery, and has main and auxiliary power supply modes. The smart battery is widely applied to various portable equipment, and is provided with a main power supply system, an auxiliary power supply system, a control management module and a battery housing, wherein the main power supply system, the auxiliary power supply system and the control management module are mounted in the battery housing; the main power supply system is provided with the main battery; the auxiliary power supply system is provided with the auxiliary battery; an output end of the control management module is connected with input ends of the main power supply system and the auxiliary power supply system respectively; and the control management module is provided with a charging management circuit, a charging selection input circuit and a power supply selection output circuit. The smart battery is reasonable in design, higher in generality and low in cost, and is provided with the main and auxiliary power supply systems that are mutually independent; the main and auxiliary power supply systems exist simultaneously; the main battery is selected to supply power preferentially; when the main battery is low, the auxiliary battery supplies the power; an alarm can be given to prompt a user to charge in time; and the problems of inconvenience and embarrassment of outage are solved.

The invention relates to an offset calibration and rail-to-rail input combined comparator, and belongs to the technical field of analogue integrated circuits. A first resistor and a second resistor are connected between the two input ends of the comparator in series; the two input ends of the comparator are connected to the upper polar plates of a first capacitor and a second capacitor through a first switch and a second switch separately; the serial connection point of the first resistor and the second resistor is connected to the upper polar plates of the first capacitor and the second capacitor through a third switch and a fourth switch separately; the two input ends of a pre-amplifier are separately connected to the lower polar plates of the first capacitor and the second capacitor; the two output ends of the pre-amplifier are connected to the two input ends of a latch through a third capacitor and a fourth capacitor separately; the two input ends of the pre-amplifier are connected to common-mode voltage through a fifth switch and a sixth switch separately; and the two input ends of the latch are connected to common-mode voltage through a seventh switch and an eighth switch separately. The comparator provided by the invention has an offset calibration function; simultaneously, the input range is enlarged to rail-to-rail; and thus, the application range is enlarged.

A phase locked loop includes a phase-frequency detector and a loop filter. The phase-frequency detector compares phases of an input signal and a feedback signal to generate first and second control signals. The loop filter includes a pull-up resistor, a pull-down resistor and a capacitance unit. The loop filter receives a first reference voltage to charge the capacitance unit through a path formed by the pull-up resistor to the capacitance unit, receives a second reference voltage to discharge the capacitance unit through a path formed by the pull-down resistor to the capacitance unit and outputs a control voltage generated based on a charge amount of the charged capacitance unit. Therefore, the phase locked loop can operate at a relatively low voltage and can operate based on a control voltage with a wide input range.

The invention discloses a data baud rate adaptive digital-analogue conversion device. The data baud rate adaptive digital-analogue conversion device comprises a plurality of parallel transceivers, a data isolator, a complex programmable logic device (CPLD) data processing module and a plurality of parallel digital to analog converters, wherein the plurality of parallel transceivers correspondingly receive a plurality of nonstandard RS 485 differential signals with different baud rates, and then convert the differential signals into transistor-transistor logic (TTL) signals; the data isolator isolates the TTL signals and then outputs the TTL signals; the CPLD data processing module performs synchronization and data decoding on the different baud rates of the isolated TTL signals; and the plurality of parallel digital to analog converters perform analogue conversion on the decoded data. The data baud rate adaptive digital-analogue conversion device solves the problems of sampling and decoding identification of the plurality of nonstandard RS 485 differential signals with the different baud rates and enlarges an input range of the signals by taking the CPLD data processing module as a core. By using a parallel processing structure of the CPLD data processing module, and channels of input signals are convenient to extend; the real-time efficiency of data processing is improved; and the conversion of multi-channel digital signals to analog signals is further realized by matching the plurality of parallel digital to analog converters. The data baud rate adaptive digital-analogue conversion device has the advantages of high adaptability, high integration level, stability, reliability and low equipment cost and is convenient to use.

The invention discloses an emergency power supply system special for an intelligent energy-saving fire control emergency lamp. The emergency power supply system comprises a power supply control unit and an adapter. The input end of the adapter is respectively connected with an external electric supply and a storage battery, the output end of the adapter is connected with a power supply control unit, and the adapter provides various required working voltages for the power supply control unit. The power supply control unit comprises a central processing unit (CPU), a charging control module, the storage battery, a power conversion module, an input output detection module and an output circuit. The adapter comprises a filtering rectifying circuit, a switch oscillation circuit, an oscillation and pulse width modulation control circuit, a multi-way rectifying filtering circuit, a direct current (DC) sampling circuit and a DC output circuit group. The emergency power supply system combines electric supply power supply and storage battery power supply, ensures normal work of the emergency lamp, reduces safety hazards, is capable of charging storage batteries with different capacities and voltages in the series of products, simplifies circuit structure and reduces cost. The power supply input range accepted by the adapter of a switch power supply is large.

The invention discloses a variable structure control method of a grid-connected photovoltaic system, used for controlling a two-stage circuit structure or a single-stage circuit structure. The method comprises the following steps of respectively determining each control point value, comprising V1-V6 and Vr1-Vr4, wherein a reference voltage value of a direct current bus is Vref, and an actual output voltage value of a photovoltaic battery array is VPV; and concretely controlling according to the following conditions: firstly, when the VPV of the photovoltaic battery array is ranging from V1 to V5, the grid-connected photovoltaic system works under the two-stage circuit structure and a two-stage control mode, and the set Vref of the reference voltage of the direct current bus is relevant to the size and the variation direction of the VPV; secondly, when the VPV of the photovoltaic battery array is ranging from V4 to V6, the grid-connected photovoltaic system works under the single-stage circuit structure and a single-stage control mode; and thirdly, when the VPV of the photovoltaic battery array is ranging from V4 to V5, the grid-connected photovoltaic system works under a hysteresis control mode. Through the method, the working voltage range is enlarged, and the equipment use efficiency is remarkably improved.

The invention provides a weak current detecting device and method. The weak current detecting device comprises a reference power source, a multiplying circuit, a square-rooting circuit and an I/V conversion circuit. The reference power source is electrically connected with the first input end of the multiplying circuit; the second input end of the multiflying circuit is connected with current to be detected; the input end of the square-rooting circuit is electrically connected with the output end of the multiplying circuit; the input end of the I/V conversion circuit is electrically connected with the output end of the square-rooting circuit. The weak current detecting device has the advantage of being wide in dynamic range and the like.

A current mirror circuit that amplifies a reference current generated by a current source at a first magnification to supply a mirror current to a load circuit. The current mirror circuit includes a first transistor and a second transistor that share a power supply, and a drain potential mirror unit that amplifies the reference current at a second magnification to generate a first current, that amplifies a generated first current at a third magnification to generate a second current, and that supplies a predetermined potential determined based on the second current to a drain of the second transistor. The mirror current is supplied from the second transistor to the load circuit based on a potential of a gate of the first transistor determined based on the reference current

The invention relates to an auxiliary power supply circuit. The auxiliary power supply circuit comprises a power transformation module and a secondary output module. The power transformation module is used for receiving input voltage and transforming the input voltage. The secondary output module is sued for outputting transformed voltage. The power transformation module switches between a flyback mode and an LLC mode based on the input voltage. In this way, because the power transformation module switches between the flyback mode and the LLC mode based on the input voltage, the auxiliary power supply circuit can work in a hard switching state in the flyback mode, thereby ensuring a wide input range, and can work in a soft switching state in the LLC mode, thereby ensuring high transformation efficiency and power density.

The invention discloses a video clamping circuit comprising a transconductance amplifier and a current mirror amplifier, wherein the transconductance amplifier consists of a PMOS (P-channel Metal Oxide Semiconductor) transistor 1 and a PMOS transistor 2 which are butted, and the current mirror amplifier consists of a PMOS transistor 3 and a PMOS transistor 4. The video clamping circuit is characterized in that the grid electrode of the PMOS transistor 1 is connected with a Vref (Voltage Reference Device), the Vref is connected with the ground, the drain electrode of the PMOS transistor 1 is connected with the source electrode of a NMOS (N-channel Metal Oxide Semiconductor) transistor 3, and the drain electrode of the NMOS transistor 3 is connected with the drain electrode of the PMOS transistor 4. The transconductance amplifier is also connected with a filter for filtering excessive signals. The video clamping circuit relates to a clamping circuit having the advantages of low power consumption and large signal input range.

The invention discloses a CMOS transconductance unit circuit with the wide input voltage range and the high linearity. The circuit comprises a bias constant current source, a difference input grade and an output current mirror. The bias constant current source comprises a first PMOS tube M4a, a second PMOS tube M5a matching the first PMOS tube M4a, a third PMOS tube M5b and a fourth PMOS tube M4bmatching the third PMOS tube M5b. The difference input grade comprises a fifth PMOS tube M1a, a sixth PMOS tube M6a matching the fifth PMOS tube M1a, a seventh PMOS tube M6a and an eighth PMOS tube M1b matching the seventh PMOS tube M6a. The output current mirror comprises a first current mirror and a second current mirror, wherein the first current mirror is symmetrical to the second current mirror in a mirrored manner. The first current mirror comprises a first NMOS tube M3a and a second NMOS tube M2a. The second current mirror comprises a third first NMOS tube M2b and a fourth NMOS tube M3b. According to the invention, the circuit is characterized by wide common-mode input range and high linearity; the transconductance value can be tuned; and the circuit can be used for achieving high-linearity amplifier with variable gain and a tunable Gm-C integrator.