41results about How to "Small voltage fluctuation" patented technology

The invention relates to the technical field of electric energy optimization, and provides a micro-grid electric energy quality optimization treatment method and system. The method comprises the following steps: establishing a micro-grid model which comprises a power generation unit, an adjusting unit and a load group; setting a governance interval, and predicting a power generation power curve and a power utilization power curve in the governance interval; according to the power generation and utilization power curve, simulating to obtain an electric energy quality analysis value of the micro-grid; calling electric energy quality multi-dimensional constraints and judging an analysis value; when the constraint is not met, a control scheme is generated according to the power generation and utilization power curve in combination with an adjusting unit; and according to the control scheme, controlling the power generation and regulation unit in the treatment interval to supply power to the load group. The technical problem that the electric energy quality of the micro-grid is difficult to guarantee under the conditions of complex load requirements and unstable power generation is solved, and the effects of optimizing the electric energy quality of the micro-grid and guaranteeing the power utilization requirements of the industrial park through the multi-mode adjusting unit and accurate matching of the generated power and the load power are achieved.

The embodiment of the invention provides a half-bridge flyback converter, a control method thereof, a control circuit and a chip. The control method comprises the steps that when the half-bridge flyback converter works in a free resonance state, in a first switching period, a second primary switching tube is controlled to be conducted for a first time length, and according to sampling voltage information of a secondary power loop, after it is detected that the second primary switching tube is conducted, a secondary switching tube is controlled to be conducted for a second time length, the half-bridge flyback converter can perform reverse excitation so as to generate negative excitation current, the zero voltage at the two ends of the first primary switch tube is reduced to zero, and when the first primary switch tube is controlled to be switched on, zero-voltage switching-on of the first primary switch tube can be realized. According to the method, the noise of the half-bridge flyback converter can be reduced, and zero-voltage switching-on of the first primary switching tube can be realized under the DCM of the wide-range output voltage of the half-bridge flyback converter, so that the efficiency of the half-bridge flyback converter under the DCM is improved.

The invention discloses a harmonic compensation and power flow energy storage scheduling method based on wind power plant grid connection. The method comprises the following steps that S1, an ETAP builds a wind power grid connection simulation model according to a grid structure of a wind power plant grid connection power grid; s2, inputting power generation data of a wind power plant into the wind power integration simulation model, and generating a power flow curve by the wind power integration simulation model according to the power generation data; s3, performing reactive compensation and energy storage scheduling on the wind power plant according to the power flow curve, and collecting a generated scheduling harmonic wave a; s4, superposing the dispatching harmonic wave a with an inherent rectification harmonic wave b of a rectifier in the wind power plant to obtain a total harmonic wave c, and performing harmonic wave content analysis on the total harmonic wave c by FFT to generate a harmonic wave content diagram of the rectifier; and S5, performing harmonic compensation on the wind power plant according to the harmonic content diagram of the rectifier. Reactive compensation can stabilize the power grid voltage and improve the stability of the power grid voltage. The combined filtering device can reduce the impact of harmonic waves on the power grid, thereby improving the safety, stability and reliability of the power grid.

The invention discloses an LDO (Low Dropout Regulator) circuit with a dynamic load compensation function, which relates to the technical field of power management, and is characterized by comprising an error amplifier, a power tube M1, a feedback circuit and a dynamic load compensation circuit, the power tube M1 is a P-type field effect transistor; the feedback circuit detects the output voltage and feeds the output voltage back to the error amplifier; and the dynamic load compensation circuit is connected with the drain electrode of the power tube M1 and is used for sensing the change of the output voltage VOUT and adjusting the driving current I0 output by the drain electrode of the power tube M1 according to the change of the output voltage VOUT. According to the LDO circuit, the output current of the power tube is dynamically adjusted through the dynamic load compensation circuit, then the output voltage is adjusted, the dynamic load compensation circuit during transient response simulation can effectively reduce the response recovery time of the output voltage during transient change of the current load, and therefore the LDO circuit can stably and efficiently operate.

The invention relates to a DC-DC converter control method based on an intelligent agent reinforcement learning algorithm, and the method comprises the steps: firstly building an intelligent agent for a DC-DC buck converter which supplies power to a constant-power load, obtaining a state observation quantity formed by all preset environment variable values of the DC-DC buck converter through the intelligent agent, and obtaining the state observation quantity of the DC-DC buck converter; and a reward value corresponding to a difference value between the output voltage and a preset reference voltage is processed by the intelligent agent, and a corresponding action signal is output and used for controlling the DC-DC buck converter. And then through reinforcement learning training of the intelligent agent, the trained model controls the DC-DC buck converter, so that the output voltage of the DC-DC buck converter has good adaptivity and dynamic response characteristics under different working conditions, and the designed intelligent agent has good steady-state performance in application, so that the stability of the DC-DC buck converter is improved. Model parameter uncertainty caused by component aging can be dealt with, and the stability in practical application is ensured.

The utility model discloses a distributed photovoltaic box transformer substation, which comprises a high-voltage chamber, a low-voltage chamber and a transformer chamber which are arranged in a delta shape, a transformer is arranged in the transformer chamber, a combined vacuum circuit breaker, a metering current transformer, a confluence cable and an outgoing cable are arranged in the high-voltage chamber, the combined vacuum circuit breaker is connected with the confluence cable, and the metering current transformer is connected with the outgoing cable. An SVG high-voltage chamber is further arranged on the side, away from the transformer chamber, of the high-voltage chamber, an SVG vacuum circuit breaker and an SVG incoming cable are arranged in the SVG high-voltage chamber, and the SVG vacuum circuit breaker is communicated with a reactive power compensation device outside the SVG high-voltage chamber through the SVG incoming cable. According to the invention, reactive power is compensated through the reactive power compensation device, so that the power factor of the system is maintained within a reasonable range. The invalid power in the power grid is reduced, and the efficiency of the power grid is improved. Meanwhile, the voltage of the power grid can be adjusted and kept at a stable level, the voltage fluctuation of the power grid can be reduced, and the stability of the power grid is improved.

The invention discloses a method for realizing a hybrid power storage battery by using a conventional storage battery and a capacitor, belongs to the field of storage batteries, relates to a chemical energy storage storage battery and the application field thereof, and is suitable for a use scene that the storage battery needs to provide continuous lower power and instantaneous high power. According to the invention, the one-way functional part is additionally arranged between the conventional storage battery and the capacitor, so that the voltage of the capacitor is not lower than that of the storage battery, the capacitor does not lose electric quantity due to the stop of an external charging power supply, and the capacitor can release electric energy prior to the storage battery when an instantaneous high-power discharge demand exists. The electric energy is preferentially released through the capacitor, and the instantaneous high-power discharge probability or / and discharge intensity of the storage battery is eliminated or reduced, so that the service life of the storage battery is prolonged, the reliability of an electric power storage system is improved, the requirement of the application scene on the performance of the storage battery is reduced, and the electric power storage cost is possibly reduced.

This application provides an adaptive control method and system for a lead-acid battery charge-discharge switching circuit, relating to the field of adaptive control technology. The method determines the pre-trigger time for charge-discharge switching by measuring the duration of the mains input voltage exceeding the limit between adjacent power frequency cycles; determines the amount of stored charge in the bus capacitor before switching; and determines the power step that the discharge branch needs to bear at the moment of switching, further determining the conduction sequence of the power switching devices in the discharge branch, and causing the discharge branch to gradually accept load current according to the conduction sequence. The method controls the release of stored charge from the bus capacitor to the bus side and performs damping compensation for the transient voltage drop on the bus generated during the discharge branch's acceptance of load current, obtaining a damped recovery trajectory for the bus voltage. The bus voltage is then restored to the steady-state voltage level through the damped recovery trajectory, entering steady-state discharge control. This application can achieve dynamic and stable bus control during charge-discharge switching, thereby reducing bus voltage fluctuations at the moment of switching.

The invention relates to the technical field of asynchronous power generation, and discloses an asynchronous power generation system reactive compensation capacity determination method, which comprises the following steps: acquiring each asynchronous generator in an asynchronous power generation system and generator basic information and transformer substation basic information corresponding to a network access transformer substation corresponding to the asynchronous generator; reactive power compensation capacity required by each asynchronous generator and reactive power compensation capacity required by a network access substation are calculated; according to the distance between each asynchronous generator and the corresponding network access substation, determining a planning path corresponding to a power transmission line connecting the asynchronous generator and the network access substation, and according to the planning path corresponding to the power transmission line, calculating reactive compensation capacity required by the power transmission line; and calculating the reactive compensation total capacity corresponding to the asynchronous power generation system based on a preset compensation total capacity calculation formula.

The invention discloses a high-voltage constant-voltage digital power supply for lampblack purification, which belongs to the technical field of air purification, and comprises a rectification filter circuit, an auxiliary power supply circuit for providing weak current, an MOS (Metal Oxide Semiconductor) tube isolation driving circuit for controlling power conversion, and a single chip microcomputer processing circuit for generating signals and controlling an algorithm, the high-voltage sampling circuit is used for converting a detection voltage; the communication and output interface circuit is used for transmitting a communication signal; the output indicating circuit is used for representing a power supply state; the relay state circuit is used for representing a system operation condition; the nixie tube display circuit is used for displaying the voltage in real time; and the key input circuit is used for adjusting the voltage. Through the mode, the high-voltage voltage of the lampblack electric field charge area is used as a control target to stabilize the high-voltage voltage, so that stable and efficient lampblack purification is ensured, meanwhile, nixie tube voltage display and fault code display functions are achieved, and the working state of the working voltage of the electric field is visually and conveniently checked.

The invention discloses a rural power distribution network adjusting method and system considering load damage and node coupling degree. The method comprises the steps of collecting voltage, current, injection active power and injection reactive power of each load node of a power distribution network; based on the dynamic impedance matrix, obtaining an electrical distance between the load nodes, and according to the electrical distance between the load nodes, carrying out partitioning on the load nodes by adopting an agglomerated hierarchical clustering method; in any partition, a reactive power compensation node selection model is established according to the impedance mode margin and the node comprehensive coupling degree, and reactive power compensation nodes in the partition are determined according to the model; based on the least square method, a fitting model of the reactive compensation capacity in the partition and the impedance modulus margin at the reactive compensation node is established, and when the minimum value of the impedance modulus margin at the reactive compensation node is smaller than an impedance modulus margin threshold value, the impedance modulus margin threshold value is used as a benchmark, and based on the fitting model, the impedance modulus margin is calculated; and determining the reactive compensation capacity configured by the reactive compensation node in the partition. According to the invention, the problems of uneven load, large power loss and unstable voltage of the rural power distribution network are solved.

The invention relates to an energy management method and system suitable for an electric vehicle charging station. The method comprises the steps that related electrical parameters of the charging station and energy management data of the charging station are acquired; establishing an energy management learning network of the charging station; training the energy management learning network to obtain a well trained energy management learning network; and the energy of the charging station is managed through the well-trained energy management learning network. According to the invention, multi-parameter collaborative accurate scheduling is realized, the operation cost of the charging station can be reduced, the voltage fluctuation of the DC bus is controlled, the SOC value of the super energy storage system is maintained in the optimal interval, the energy utilization efficiency and the stability of the power distribution network are improved, and the large-scale and intelligent operation requirements of the charging station are met.

The invention provides a wind power plant AVC substation and a coordination control device and method for dynamic reactive voltage control, and belongs to the field of new energy power generation, and the device comprises an AVC voltage control logic module, a dynamic voltage regulation control logic module, an AVC function soft pressing plate, a dynamic voltage regulation soft pressing plate, and a soft pressing plate switching module. A target voltage value is respectively input into the AVC voltage control logic module and the dynamic voltage regulation control logic module, an output signal of the AVC function soft pressing plate is respectively input into the AVC voltage control logic module and the soft pressing plate switching module, and an output signal of the dynamic voltage regulation soft pressing plate is input into the soft pressing plate switching module. The soft pressing plate switching module outputs a signal to the dynamic voltage regulation control logic module after performing logic combination operation, operates the AVC voltage control logic module or the dynamic voltage regulation control logic module, calculates a reactive power remote regulation total instruction, sends the reactive power remote regulation total instruction to the reactive power distribution strategy and algorithm module, calculates reactive power needing to be compensated, and outputs the reactive power through a remote regulation output port; and the steady-state operation capability of the wind power plant is improved by utilizing the reactive power regulation capability of the wind turbine generator.

The invention belongs to the technical field of energy storage management, and particularly relates to a user-side efficient energy storage management system based on big data, and the system comprises a power generation unit, an energy storage unit, a detection unit, a control platform, a power utilization plan module, and a scheduling plan module. The power generation unit generates electric energy through a power generation assembly and transmits the electric energy to the energy storage unit. Adaptation is carried out according to the actual scale of the user side, the power generation units and the storage units are correspondingly arranged according to the number of the workshops, and under the condition that no less than one set of workshops exist, the power of the multiple storage units can be connected with power supply of any workshop through the storage distribution module, that is, one workshop always adopts power grid power supply; and the power grid power supply of the other plant is switched by utilizing the power generation quantity of the two power generation units and the energy storage of the two storage units and combining the power consumption of the plant, so that the electric charge can be saved, the pressure of the user side on the regional power grid load can be reduced, and the frequency of power supply switching can be reduced.

The invention discloses a self-adaptive space energy system, and the system comprises a power management unit which controls an electromagnetic induction type wireless charging device, a graphene battery pack or a ground power supply to supply power to a spacecraft through transmitting a power control signal to a power distribution module according to the working mode information transmitted by an external main control computer, charging and discharging of the graphene battery pack are controlled; wake-up control of the graphene battery pack is carried out through a wake-up instruction sent by the wake-up module or an internal timing wake-up signal; detecting a power supply state according to the working state information fed back by the power distribution module; the electromagnetic induction type wireless charging device charges the graphene battery pack in a wireless charging mode; the wake-up module is used for performing signal conversion on the external light wake-up signal, generating a wake-up instruction and sending the wake-up instruction to the power management unit; the power distribution module supplies power to equipment needing power supply; and the working state information is fed back to the power management unit. According to the invention, the reliability problem of a single wake-up mode in a long-time sleep mode is solved.

The invention provides a voltage stabilization control method for an automobile generator, and relates to the technical field of generators, and the method comprises the steps: defining a target function, carrying out the initialization control of a target automobile generator, and determining an initial control parameter set; performing voltage stabilization analysis based on the initial control parameter set, constructing a voltage stabilization control mechanism to perform hierarchical control on the target automobile generator, adjusting the target automobile generator through a global layer and a local layer, and generating global distribution parameters and local distribution parameters; correlation analysis is carried out based on the distribution parameters, and a voltage stabilization control task is generated; and executing the voltage stabilization control task to perform generator performance verification, optimizing the voltage stabilization control task according to the performance response state, and generating a voltage stabilization optimization control strategy. The technical problem that an existing automobile generator voltage stabilization control method lacks a global adjustment and local adjustment cooperation mechanism and cannot adjust generator control parameters in time according to actual working conditions is solved, generator voltage fluctuation is reduced, and power supply quality is improved.

The invention relates to the technical field of electric energy quality control, in particular to a control method of a cascade H-bridge photovoltaic grid-connected inverter under the unbalanced working condition of a power grid, which comprises the following steps of: S1, establishing a direct current side total voltage control method to obtain a reference value of an active current component required to be injected into the power grid by the inverter; s2, establishing a current positive and negative sequence inner loop control method, and tracking the positive and negative sequence current instructions to obtain positive and negative sequence voltage modulation signals; s3, generating a negative sequence current feed-forward item based on a negative sequence current injection method, and merging the feed-forward item into calculation of a direct current side voltage control output value to complete inter-phase power balance control; and S4, carrying out carrier phase-shifting modulation based on the phase-shifting angle which changes in real time, and completing in-phase power balance control. According to the invention, the problem of power imbalance of the cascaded H-bridge photovoltaic grid-connected inverter under the unbalanced working condition of the power grid can be well improved, and the inverter is ensured to safely and stably provide three-phase balanced current.

The present invention relates to the field of distribution transformers. The present invention provides a staggered parallel seven-speed transformer on-load voltage regulation circuit with polarity conversion, including a main winding, a polarity conversion switch, a voltage regulating winding, a transition switching unit, a rated voltage branch, and four voltage regulating branches; the present invention sets a polarity conversion switch between the main winding and the voltage regulating winding, and realizes positive and negative voltage regulation by adjusting the independent contact connection end of the polarity conversion switch; one end of each voltage regulating branch is respectively connected to the two end taps and each middle tap of the voltage regulating winding; the other end is adjacently staggered in parallel to form two groups, respectively connected to the two input ends of the transition switching unit, the input end of the rated voltage branch is connected to the main winding output end tap, and the output end of the rated voltage branch is connected to the output end of the voltage regulating circuit. The beneficial effects of the present invention are to reduce the on-off frequency of the on-off switch, increase the service life of the corresponding voltage regulating switch, and in the voltage regulation process, the transition voltage changes with the voltage regulating gear, and there is no need to jump the gear to regulate the voltage.

The invention provides a modulator for a multi-level wireless charging system and an application method, belongs to the technical field of wireless electric energy transmission, and solves the problems that an existing method is large in output ripple and needs to add an additional circuit to maintain flying capacitance balance. The modulator comprises a finite-state machine, a proportional element, an integrator, a multiplier, a delay element and a microcontroller. The microcontroller is used for providing an external signal sign and an external signal k. The initial voltage delta FC-SDM of the inverter is input into the multi-level soft switching modulator, a signal i is obtained by combining the initial voltage delta FC-SDM with an external signal sign, and the finite-state machine is used for quantizing the input signal i; the integrator integrates the input delta and a feedback signal y of the finite-state machine to obtain an output e; the output e of the multiplier is multiplied by the signal sign to obtain the input i of the state machine; the delay link is used for controlling signal triggering time.

The invention discloses a dynamic loss control method for an annular bus of a motor driver, which belongs to the technical field of motor driver control and comprises the following steps: a pulse optimizer changes pulse modulation of multi-phase voltage to generate a modulation signal; solving to obtain real-time current distribution of the annular bus by the mathematical solving model; the loss calculation module calculates the real-time ohmic loss of the annular bus according to the current distribution and the distribution resistance of the annular bus, and feeds the real-time ohmic loss back to the pulse optimizer; the pulse optimizer continuously adjusts the modulation signal and compares the change of the ohmic loss until the ohmic loss reaches the minimum value, and the modulation signal at the moment serves as a final control command; and finally, the control command is sent to each driving bridge arm. According to the method, the loss of the motor driver bus is controlled to reach the minimum value, and the phenomena of voltage fluctuation, current imbalance and ring current on the annular bus can be effectively reduced, so that the ring current of the distributed driver bus can be effectively avoided, and the efficiency of the motor driver is improved.

The invention discloses a simple method for judging the performance difference of GND integration and separation of different modules in a circuit board. The method comprises the steps of S1, experiment preparation; a substrate processing and testing tool; the method comprises the following steps of S1, performing GND integration setting and testing, S2, performing GND separation setting and testing, S4, performing performance difference analysis, performing power supply stability analysis, comparing measurement data of power supply node voltage fluctuation under GND integration and GND separation conditions, comprehensively considering actual application requirements and performance requirements of a circuit board, and judging which mode of GND integration or separation is more suitable for the circuit board. The switching of the GND connection modes of the whole substrate is realized by changing the GND layer in the test, the substrate is firstly subjected to circuit design according to the independent mode of each GND, then on the basis, each independent GND of the second layer is integrated into a whole to realize the integration of the GND, solder resists with different colors are selected, the substrates with different GND connection modes are distinguished, and the test efficiency is improved. Therefore, the cost of the circuit board can be effectively controlled in the processing process of the circuit board.

The utility model relates to a reading auxiliary circuit, a memory and electronic equipment, the reading auxiliary circuit comprises a voltage gate, the input end of the voltage gate is connected with a first driving signal, and the output end of the voltage gate is used for providing different driving voltages for a bit line and a reverse bit line connected with a sensitive amplifier; a first switching unit; the second switch unit is connected with the first switch unit; the first input end of the driver is connected with the output end of the voltage gate through a first switch unit, and the second input end of the driver is connected with the output end of the voltage gate through a second switch unit; wherein the first switch unit is used for transmitting a driving voltage on a bit line to a first input end of the driver when receiving a second driving signal; and the second switch unit is used for transmitting the driving voltage on the reverse bit line to the second input end of the driver when receiving a third driving signal. And the BL-BLB voltage difference delta V is improved through a scheme of pulling the high-bit line voltage, so that the accuracy and the stability during reading are ensured.

The utility model relates to a super capacitor discharge circuit and device for a non-discharge control acquisition terminal, which comprises a reference voltage generation circuit, a triangular wave generation circuit, a PWM (Pulse Width Modulation) generation circuit and an adjustable voltage generation circuit, and the output ends of the reference voltage generation circuit and the triangular wave generation circuit are connected with the input end of the PWM generation circuit. The output end of the PWM generation circuit is connected with the input end of the adjustable voltage generation circuit; and the adjustable voltage generation circuit is connected with the acquisition terminal and is used for starting the acquisition terminal and starting the super capacitor to discharge by adjusting an output signal of the PWM generation circuit. By simulating main power supply and gradually regulating voltage, the power consumption of the capacitor is directly utilized, the operation process is simplified, and the discharge efficiency is improved; through circuit design, a wide power supply voltage range can be covered, voltage specifications of different super capacitors can be flexibly matched, and the problem of low discharge efficiency caused by load mismatching in a traditional scheme is avoided.

An object of the present invention is to provide a display using a vertical organic light emitting transistor in which voltage fluctuation of a current supply line is reduced. A liquid crystal display device includes: a substrate; a plurality of vertical organic light emitting transistors; a data line that supplies a voltage to a gate electrode of the vertical organic light emitting transistor; a thin film transistor that is connected between the gate electrode of each of the vertical organic light emitting transistors and the data line and controls the supply of voltage to the gate electrode of the vertical organic light emitting transistor; a gate line that is connected to the gate electrode of the thin film transistor and transmits a signal for switching the thin film transistor; and a plurality of current supply lines that are wired outside a formation region of the vertical organic light emitting transistor in a first direction, the current supply lines being in contact with a source electrode of the vertical organic light emitting transistor to supply current to the vertical organic light emitting transistor.

The invention discloses a three-level inverter direct-current neutral-point balancing method and device in an open-loop state, and relates to the field of power electronic control. The method comprises the following steps: converting three power grid voltages of a three-level inverter in an open-loop state into power grid voltages ealpha and ebeta in an alpha coordinate system; generating a corresponding positive modulation wave mabc + and a corresponding negative modulation wave mabc-based on the power grid voltage e [alpha] and e [beta]; adjusting the positive modulation wave mabc + and the negative modulation wave mabc-through a PI controller to generate a new positive modulation wave m'abc + and a new negative modulation wave m'abc-, and comparing the new positive modulation wave m'abc + and the new negative modulation wave m'abc-with a carrier signal to generate a PWM signal; a PWM signal is used to drive a power switch of a three-level inverter so as to adjust the balance of the DC neutral-point voltage. According to the scheme, the voltage balance of the DC midpoint of the inverter is realized, the regulated modulation wave ensures the stability of the DC midpoint voltage under the open-loop control condition, and the stability and reliability of the system are improved.

The present invention relates to the field of distribution transformers. The present invention provides a staggered parallel nine-speed transformer on-load voltage regulation circuit with polarity conversion, including a main winding, a polarity conversion switch, a voltage regulating winding, a transition switching unit, a rated voltage branch, and five voltage regulating branches; the present invention sets a polarity conversion switch between the main winding and the voltage regulating winding, and realizes positive and negative voltage regulation by adjusting the independent contact connection end of the polarity conversion switch; one end of each voltage regulating branch is respectively connected to the two end taps and each middle tap of the voltage regulating winding; the other end is adjacently staggered in parallel to form two groups, respectively connected to the two input ends of the transition switching unit, the input end of the rated voltage branch is connected to the main winding output end tap, and the output end of the rated voltage branch is connected to the output end of the voltage regulating circuit. The beneficial effects of the present invention are to reduce the on-off frequency of the on-off switch, increase the service life of the corresponding voltage regulating switch, and in the voltage regulation process, the transition voltage changes with the voltage regulating gear, and there is no need to jump the gear to regulate the voltage.

The invention discloses an energy storage method and device adopting a power electronic transformer, relates to the technical field of power electronic transformers, and solves the problems that the cooperation of energy consumption optimization and voltage matching precision is not fully considered, the energy conversion efficiency in the power storage process is relatively low, and the voltage fluctuation in the discharge process is relatively large. According to the method, the targeted turn number adjustment logic is adopted in the electricity storage state and the discharging state respectively, flexible adjustment of the number of turns of the transformer along with SOC characteristics and input voltage during dynamic adaptive electricity storage is achieved, and accurate matching of the number of turns of the transformer along with discharging voltage and electricity utilization requirements during discharging is achieved; the dynamic adjustment capability breaks through the limitation of a fixed transformation ratio of a traditional transformer, so that the thermal power energy storage system can flexibly respond to voltage requirements in different energy storage states, and the operation adaptability and regulation and control flexibility of the system are remarkably improved.

The utility model provides an on-line monitoring and diagnosing system for a flowmeter, and belongs to the technical field of monitoring and diagnosing systems. Comprising a master control circuit, a power circuit, a diagnosis circuit and an indication circuit. The power supply circuit provides direct current for the main control circuit, the diagnosis circuit and the indication circuit, the power supply circuit comprises an alternating current voltage reduction unit, a first voltage stabilization unit, a second voltage stabilization unit and a signal isolation unit, and the alternating current voltage reduction unit is used for reducing the voltage of an alternating current power supply and converting the reduced alternating current into the direct current; the output voltage can be finely adjusted by adjusting the potentiometer R5, the voltage output from the chip LM is input into the voltage stabilizer WD, after the voltage is further stabilized by the voltage stabilizer WD, stable direct-current voltage is output from a pin Vout of the voltage stabilizer WD to be used by the single-chip microcomputer UF, the smooth and stable direct-current voltage can guarantee normal work of the single-chip microcomputer UF, the photoelectric coupler U1 can electrically isolate external signals, and the output voltage of the single-chip microcomputer UF is greatly improved. The anti-interference capability of the circuit is enhanced, and the internal circuit is protected, so that the monitoring and diagnosis system can work continuously and stably.

The utility model relates to sputum suction machine pressure regulating technical field, concretely is sputum suction machine negative pressure regulating valve, including valve body, the bottom end of valve body is connected with valve nozzle, the inside top of valve body is equipped with internal thread, the inside of valve body is provided with swingle, and the surface of swingle is provided with external thread, and external thread and internal thread are connected with each other threadedly, the inside top of valve nozzle is equipped with step groove, and the inside of step groove places sealing ring, and the sealing ring is used for sealing work. The utility model discloses through the cooperation of sealing ring and swingle bottom, makes the pressure regulating fluctuation when rotating smaller, simultaneously the utility model discloses through setting up external thread on swingle, setting up internal thread in the inside of valve body, through the thread cooperation of external thread and internal thread, can pass through accurate pitch calculation, reaches the controllable range of stroke, and the precision of air pressure adjustment.

The utility model provides a kind of DC switching power supply and electric sliding door controller of electric sliding door, including main control circuit, motor drive circuit and switching power supply circuit, switching power supply circuit includes rectifier filter module and high frequency conversion module, width modulation square wave rectifier filter module and sampling comparison modulation module, switching power supply further includes voltage stabilizing module, voltage stabilizing module includes first stabilizer and second stabilizer, the input end of first stabilizer is connected with the output side of width modulation square wave rectifier filter module, the output end of first stabilizer is connected with the input end of second stabilizer, the output end of second stabilizer is connected with the power input end of main control circuit, the output end of first stabilizer is also connected with the power input end of motor drive circuit.Construction is built with 'high frequency conversion+multistage voltage stabilizing' framework, replaces traditional direct power supply, and voltage is adapted for motor, main control respectively, voltage instability problem is solved, and equipment reliability is improved.