36results about How to "Realize constant voltage output" patented technology

The invention is applicable to the technical field of switching power supplies, and provides a switching power supply and a multi-threshold switching circuit thereof. The multi-threshold switching circuit is characterized in that a sampling voltage judgment module is used for dividing voltage outputted by a power supply circuit, comparing the voltage with a first reference voltage, a second reference voltage and a third reference voltage outputted by a reference voltage generating module and outputting corresponding control signals to a voltage-controlled oscillation module according to comparison results; the voltage-controlled oscillation module is used for generating pulse signals with specific duty ratio according to a fourth reference voltage and a fifth reference voltage which are outputted by the reference voltage generating module and the control signals; and a power switch is used for high-frequency on-off switching with a corresponding frequency according to the pulse signals to enable a transformer to perform storage and release of electricity energy correspondingly, so that output voltage of the transformer is periodically modulated to achieve stable contact voltage output. The switching power supply is further simplified structurally by the aid of the multi-threshold switching circuit, and cost is reduced.

The invention discloses a charging method based on the constant current-constant voltage output characteristics of a wireless electric energy transmission system. LC/S compensation topology is adoptedto replace a direct current input voltage source and an inverter in the LC/S compensation topology with a sinusoidal voltage source of which the frequency is equal to inverter switching frequency, the parasitic resistance of an inductor and a capacitor is ignored, and a loose coupling transformer is replaced with a mutual inductance model to obtain an equivalent mutual inductance model circuit; afull bridge rectifying circuit is replaced with an equivalent load resistor RE, and a primary side parallel compensation capacitor C1 is split into capacitors C1' and C1'' to form LC, CL and series resonant cavities to obtain a simplification circuit; a mutual conductance gain Gi and a voltage gain Gv are defined to obtain a frequency point when the wireless electric energy transmission system has constant current output characteristics and constant voltage output characteristics; and the system is under the obtained frequency point to carry out constant current-constant voltage sectional charging. By use of the method, through the same compensation topology transformation work frequency point, wireless electric energy transmission constant current or constant voltage output characteristics are realized, and therefore, the sectional charging of the battery is realized.

The invention provides a flyback switching power supply and an over-current protection method thereof. The over-current protection method of the flyback switching power supply comprises the following steps of: starting a current close loop control circuit to output a first error voltage when an output current is more than a rated current; starting a voltage close loop control circuit to output a second error voltage when the output current is more than the rated current; converting the first error voltage into a first error current or the second error voltage into a second error current through an optocoupler; and controlling the output current based on the first error current or controlling the output voltage based on the second error current through a control chip. The over-current protection method is characterized in that the power is supplied to the current close loop control circuit, the voltage close loop control circuit and the optocoupler through a voltage stabilization chip so that the switching power supply outputs the constant output current when the output current is more than the rated current.

The invention discloses a constant voltage frequency conversion speed control instrument which comprises a controller, a frequency converter, a water pump and a pressure sensor. The frequency converter is electrically connected with a frequency conversion motor of the water pump, a pump outlet of the water pump is connected with an anal tube, the pressure sensor is disposed at the position of thepump outlet, the pressure sensor and the frequency converter are electrically connected with the controller, the pressure sensor feeds detection parameters back to the controller, the controller performs PID calculation on the detection parameters of the pressure sensor and pre-determined pressure, the controller transmits obtained control signals to the frequency converter, the frequency converter controls the rotating speed and torque of the frequency conversion motor according to the control signals, and outlet pressure of the water pump is equal to the predetermined pressure. According tothe constant voltage frequency conversion speed control instrument, the pressure of clysis fluid can be monitored and controlled in real time, the enterobrosis incidence rate is reduced, and the constant voltage frequency conversion speed control instrument is an ideal, simple and safe medical device for performing intussusception reduction.

The invention discloses an integrated oxygen supply valve. A valve body, a valve cover, a filling module, a flow adjusting module and a pulse oxygen supply module are included, wherein the filling module, the flow adjusting module and the pulse oxygen supply module are arranged on the valve body and the valve cover. Oxygen in a gas tank is output by the pulse oxygen supply module after passing through the filling module and the flow adjusting module. The pulse oxygen supply module comprises a gas inlet unit, a gas outlet unit and a gas suction unit. The gas inlet unit comprises a sixth gas wayand a seventh gas way which conduct gas inflow from the same gas inlet source. The gas outlet unit comprises a gas outlet outer connector arranged on the valve body, a gas outlet valve plate and a gas outlet cavity. The gas suction unit comprises a gas suction outer connector arranged on the valve cover, a gas suction valve plate and a gas suction cavity, the gas suction valve plate is provided with a gas inlet protruding nozzle communicating with the gas outlet cavity, and a gas inlet membrane for opening and closing the gas inlet protruding nozzle is arranged above the gas inlet protrudingnozzle. An integrated mechanical structure is adopted in the valve, filling operation and usage are simple and convenient, the different-flow requirements can be met, and different-breathing-manner requirements can be met as well.

The invention discloses intussusception treatment equipment and a control method. The intussusception treatment equipment comprises a power interface, a keyboard, a shell, a display screen, a liquid adding opening and an anal tube; the power interface used for being connected with a medical power supply is arranged on the first side face of the shell; the display screen is arranged on the front face of the shell; the keyboard is arranged on the front face of the shell and located below the display screen; the liquid adding opening is formed in the top face of the shell and communicates with a liquid storage container (10) arranged in the shell; the anal tube is connected with a liquid outlet pump (15) arranged in the shell and penetrates through the second side face of the shell; the anal tube is provided with a pressure sensor (17) for acquiring the pressure of enema liquid, and the pressure sensor (17) is arranged in the shell and is connected with a controller which is also arranged in the shell; the controller, a frequency converter (13) and a motor (14) of the liquid outlet pump (15) are connected in sequence; and the controller is also connected with the keyboard.

The invention discloses a gas cylinder type pressure-stabilizing dual-mode oxygen supply device. The gas cylinder type pressure-stabilizing dual-mode oxygen supply device comprises a gas cylinder, a nasal oxygen tube and an integrated valve mounted on the gas cylinder, wherein a nasal suction joint on the nasal oxygen tube is inserted into a nasal cavity of a user; a gas outlet outer joint and a gas suction outer joint of the integrated valve are connected with a gas inlet of the nasal oxygen tube; the integrated valve comprises a valve body, a valve cover, a filling module, a flow regulatingmodule and a pulse oxygen supply module, wherein the filling module, the flow regulating module and the pulse oxygen supply module are mounted on the valve body and the valve cover; oxygen in the gascylinder passes through the filling module and the flow regulating module and then is output by the pulse oxygen supply module; the pulse oxygen supply module comprises a gas inlet unit, a gas outletunit and a gas suction unit; and the gas inlet unit comprises a sixth gas channel and a seventh gas channel which are used for feeding gas through the same gas inlet source. According to the gas cylinder type pressure-stabilizing dual-mode oxygen supply device, all mechanical parts are adopted to realize continuous and pulse dual-mode oxygen supply, and a pressure stabilizing module and the filling module are integrated inside, so that the device structure and gas guide tube connection are simplified, and therefore, use of the user is convenient.

The invention discloses a lead-acid battery charger and belongs to that technical field of lead-acid batteries, include a single chip microcomputer control module, power management module, Voltage Sampling Comparison Module, Current Sampling Comparison Module, The battery voltage identification module, the charging current indication module, the saturation display module and the reference voltagesource module. The signal input end of the single-chip microcomputer control module is connected with a time setting unit and a switching unit. The switching unit comprises a manual switch. The invention controls the single-chip microcomputer to output a low-level/high-level signal by turning off/off the manual switch. And then the lead-acid battery to be scrapped is strongly charged and activated, the signal output end of the single chip microcomputer control module is connected with a current sampling and comparing module, The voltage sampling comparison module and the input of the saturation display module regulate the comparison value of the control current sampling comparison module and the comparison point of the voltage sampling comparison module, thereby realizing that the power management module controls the constant voltage or constant current output of the charger, and realizing the purpose of constant voltage or constant current charging.

The invention discloses a constant-pressure output two-component screw valve. The constant-pressure output two-component screw valve is provided with a stator fixing seat used for fixing a stator; the stator fixing seat is provided with two stator outlets and two valve body outlets; one stator outlet corresponds to one valve body outlet; the stator outlets and the valve body outlets which correspond to each other are connected through flow channels; and pressure adjusting mechanisms are arranged in the flow channels, so that glue passes through the pressure adjusting mechanisms firstly and then flows out of the valve body outlets of the screw valve. According to the constant-pressure output two-component screw valve, the pressure of the glue flowing out of a screw valve body is consistent, constant-pressure output is achieved, and the influence of resistance of a product cavity or a small-diameter needle head on the glue outlet amount of the screw valve is remarkably reduced.

The invention provides a constant-voltage output capacitive wireless charging system. The system is characterized by comprising a resonance circuit I located at a transmitting end and used for converting an alternating current provided by an external power supply Vin into the constant-current output ; and a resonance circuit II which is used for converting the constant-current output into the constant-voltage output to charge a load RL. The invention provides a constant-voltage output system based on capacitive power transmission in order to solve the problem that the inductive power transmission process is sensitive to the surrounding metal. According to the system provided by the invention, the problem of insufficient electric energy transmission capability caused by the relatively smaller equivalent capacitance of a polar plate during the capacitive electric energy transmission is solved by utilizing resonance, and the constant-voltage output is realized. A specific circuit topological graph and a transmission polar plate structure are given below.

The invention discloses a secondary side parameter design method adaptive to any primary side series compensation WPT system, which can adapt to any power supply end adopting primary side series compensation, adjust capacitance values of a secondary side coil and a secondary side series compensation capacitor to realize any constant-voltage output required by a load under the condition that a primary side structure and parameters are not changed, and meanwhile, the capacitance value of the secondary side parallel compensation capacitor is adjusted to enable input impedance to be pure resistive, reactive power in the system is approximate to zero, soft switching of a switching device is achieved, and the problem that in the prior art, constant-voltage output and input ZPA designated by a load and soft switching of the switching device cannot be achieved at the same time under the condition that all parameters of a primary side, namely a power supply end, cannot be adjusted is solved.

The invention provides an air compressor unit control system and method. According to the system and method, the function of the Internet of Things is achieved, visualization, big data storage and remote operation can be conducted, intelligent control is achieved, and the labor cost is saved. The air compressor unit control system is characterized by comprising a cloud server, wherein the cloud server is connected with a remote client, a compressor Internet of Things module and a flow collection Internet of Things module, the compressor Internet of Things module is connected with a variable frequency air compressor and a power frequency air compressor set, the output end of the variable frequency air compressor and the output end of the power frequency air compressor set are connected with regulating valves, the regulating valves are connected with a main pipe, a flow meter is installed on the main pipe, and the flow collection Internet of Things module is connected with the flow meter.

The invention relates to a harmonic self-excitation constant-voltage hybrid excitation permanent magnet motor. The harmonic self-excitation constant-voltage hybrid excitation permanent magnet motor includes a case, a stator core, a stator armature winding, a rotor core, permanent magnets, a rotor harmonic winding, a rotor excitation winding and a rotation shaft; the stator armature winding is distributed in stator slots; the rotor core is composed of permanent magnetic poles and ferromagnetic poles; uneven air gaps are formed in the permanent magnetic poles; the permanent magnets are embedded into each of the permanent magnetic poles; the permanent magnets are symmetrically distributed with respect to the center lines of the permanent magnetic poles; one side of the center line of each permanent magnetic pole is slotted along a circumferential direction, the rotor harmonic winding is distributed in the slots of the permanent magnetic poles; the rotor excitation winding sleeves the pole bodies of the ferromagnetic poles; and the rotor harmonic winding is directly connected with the rotor excitation winding through a diode rectifying circuit. Compared with the prior art, the hybrid excitation permanent magnet motor of the invention has the advantages of wide-range air gap magnetic field regulating ability, self-excitation, constant voltage output and high efficiency.

The invention provides a wireless charging circuit, a control method thereof and electronic equipment, and relates to the field of wireless charging. In the wireless charging circuit, a primary side module is connected with a primary side inductor, the primary side inductor is coupled with a secondary side inductor, the secondary side inductor, a switching compensation module and a secondary side module are sequentially connected, the primary side module is externally connected with an input voltage, and the secondary side module and the switching compensation module are both connected with a load; the switching compensation module is used for switching a compensation mode according to the voltage of the load; when the voltage of the load is lower than a set threshold value, the switching compensation module is switched to a first compensation mode to realize constant current output; when the voltage of the load is larger than or equal to the threshold value, the switching compensation module is switched to a second compensation mode, and constant voltage output is achieved. In the application, the switching compensation module can be switched to different compensation modes according to the voltage condition of the load, and constant-current and constant-voltage wireless charging can be realized, so that the output power and transmission efficiency of electric energy transmission are improved.