36results about How to "The circuit is simple and reliable" patented technology

The invention discloses an electronic commutation brushless direct current and single phase fan circuit and a control method thereof. The electronic commutation brushless direct current and single phase fan circuit comprises an alternating current rectifying circuit, a switching power supply, an inverting commutation circuit, rotor-position sensor, a current sampling circuit and a controller, wherein the switching power supply is used for supplying power to a motor and the switching power supply, the switching power supply is used for generating low-voltage power supply and supplying the low-voltage power supply to an external component, the inverting commutation circuit is used for controlling motor current alternation, the rotor-position sensor is used for supplying the position information of the current rotor, the current sampling circuit is used in winding current feedback, and the controller is used for fulfilling motor commutation and circuit regulation. The electronic commutation brushless direct current and single phase fan circuit and the control method thereof have the advantages that due to the fact electronic switch components are adopted, the motor is quiet and reliable in commutation processes without any mechanical movement. Due to the fact that permanent magnet rotors are adopted, the magnet winding of an ordinary direct current motor is not needed, and loss is reduced. In addition, the whole circuit and the control method of the circuit are simple and reliable, and the performance and reliability of a whole machine are improved.

The invention discloses a universal micro electromechanical system (MEMS) pedometer and a step counting method, and belongs to the field of electronic step counting technology. The invention aims to solve the problems that conventional pedometers are large in size, low in step counting precision and easily destroyed. A MEMS three-axis acceleration sensor of the universal MEMS pedometer is used for collecting an accelerated speed of a man whose steps are counted during walking; the acceleration signal of the MEMS three-axis acceleration sensor is input to a finite impulse response (FIR) digital low-pass filter module through a serial peripheral interface (SPI); the filtering signal output end of the FIR digital low-pass filter module is connected with a collected data signal input end; a step counting signal output end of a data processing module is connected with a step counting control signal input end of a display control module; and a display control signal output end of the display control module is connected with a display signal input end of a section type liquid crystal display. The step counting method comprises steps of collecting data, detecting peak values, detecting effective axes and determining. The universal MEMS pedometer and the step counting method are used for counting steps.

The invention discloses an insulated gate bipolar transistor (IGBT) short circuit protection circuit and a control method thereof. The circuit comprises a comparator, a photoelectric coupler and a signal delay circuit. The invention aims to provide an IGBT short circuit protection device with a simple structure and low cost.

The invention provides an optical grating displacement sensor distance measuring device based on an FPGA. The functions of the optical grating displacement sensor distance measuring device consisting of four traditional signal finely dividing circuits, a direction distinguishing counting circuit and a microprocessor are realized by utilizing the programmable logic door array technology through the programming of the hardware description language, and all circuits and the microprocessor are realized through programming and are configured into a single chip of one FPGA. Except a small number ofperipheral storage and configuration chips, all logic functions of the whole system are realized in the single chip. Thereby, the invention has the advantages of low power consumption, strong anti-jamming capability, high precision, simple circuit and high stability. The circuit can be conveniently upgraded and modified only through modifying corresponding HDL languages and the program of the microprocessor without redesigning and remanufacturing a circuit board. Thereby, the invention can be widely used in fields requiring high-precision measurement and high-precision mechanical processing in complicated environment.

The invention provides a power control circuit of an electromagnetic heating device. The power control circuit comprises a rectifier module, a control module, a power tube and a resonance module. Therectifier module comprises a rectifier bridge. The rectifier bridge has a first port and a second port. The power control circuit further includes a switch connected to the rectifier bridge. The switch switches between the first port and the second port under the control of the control module so that the rectifier bridge outputs a full-wave rectification waveform or a half-wave rectification waveform. The control module drives the power tube to control the resonance module to operate under the full-wave rectification waveform or the half-wave rectification waveform so as to output different heating powers. By means of the switch, the waveform output by the rectifier bridge can be a full-wave rectification waveform or a half-wave rectification waveform, thereby realizing switching between high-power heating and low-power heating. The power control circuit is realized by a hardware circuit, and is simple, reliable, and stable. The invention also provides a power control method of the electromagnetic heating device.

The invention relates to an HVAC (heating ventilation and air conditioning) control system of a household central air conditioner, comprising an HVAC system controller, a centrifugal blower motor, a compressor motor, and an axial fan motor, wherein the HVAC system controller comprises an HVAC microprocessor, a sensor, a motor control interface unit and a power supply portion; the power supply portion is used to supply power for circuits of various parts; the sensor transmits a detection signal to the HVAC microprocessor through a signal processing circuit, wherein at least one of the centrifugal blower motor, the compressor motor and the axial fan motor is a permanent magnet synchronous motor without a motor controller; the motor control interface unit comprises an inverter unit and a rotor position detecting unit; the HVAC microprocessor drives the permanent magnet synchronous motor without the motor controller through the inverter unit; the rotor position detecting unit transmits a rotor position signal of the permanent magnet synchronous motor without the motor controller to the HVAC microprocessor to process. According to the invention, overlapped circuit configuration is removed, circuit structures are simplified, product cost is reduced greatly, and resource waste is reduced.

The invention provides an under-voltage protection circuit used for protecting a power supply of an electric appliance when an external input voltage is too low. The electric appliance comprises a filter network, a bridge rectifier unit, an active power factor correction boost module, and a power supply controller. The under-voltage protection circuit is characterized in that the circuit is connected between an output terminal of the bridge rectifier unit and an input terminal of the power supply controller; and when the output voltage of the under-voltage protection circuit is lower than the turn-off threshold voltage of the power supply controller, the power supply controller stops working, and the power supply of the electric appliance is cut off. The technical proposal has lower cost and simple and reliable circuit, solves the problem that the hysteresis amount of the power supply controller in the prior art can not meet the demands in practical application, and improves the turn-off speed of the power supply.

The invention provides a protection circuit. An input end of the protection circuit is connected with a DC (Direct Current) power supply, an output end of the protection circuit is connected with a load, the protection circuit comprises a fuse, a diode and a capacitor, wherein the fuse is connected in the protection circuit in series, the diode is connected with the load in parallel, a cathode of the diode is connected with an anode of the DC power supply, and the capacitor is connected between the protection circuit and the ground. The protection circuit provided by the invention has the beneficial effect that the protection for various abnormal conditions such as over current, opposite phase and static of the power supply and the load can be realized. The protection circuit provided by the invention has the advantages that the circuit is simple and reliable, the cost is low, and the safety performance of the power supply and the load can be greatly increased.

The invention discloses a low-shake nanosecond high voltage pulse driving power supply which comprises a 5V trigger signal generation circuit, an avalanche transistor series triggering pulse generation circuit, a plane audion trigger circuit and a high voltage trigger tube pulse generation circuit. The avalanche transistor series triggering pulse generation circuit is triggered by the 5V trigger signal generation circuit so as to generate high voltage pulse, the high voltage pulse is inputted in the plane audion trigger circuit, and the plane audion trigger circuit generates low-shake fast leading edge high voltage pulse signals and drives the high voltage trigger tube pulse generation circuit to output low-shake fast leading edge high voltage pulse. The low-shake nanosecond high voltage pulse driving power supply has the advantages of being simple, reliable, good in performance, good in portability, convenient to achieve, easy to popularize, adjustable in parameter and convenient to operate in a system circuit. The low-shake nanosecond high voltage pulse driving power supply can achieve that high voltage pulses with different ranges can be outputted by adjusting high voltage trigger tube anode high voltage HV4, and thus is convenient to use.

The invention provides a converter valve steady-state operation test device using a capacitor to bear bias voltage and a converter valve steady-state operation test method thereof. The device comprises a test valve 1, a test valve 2, a capacitor CL, a transformer T1, a circulating current restraining reactor L01, a switch K01 and an AC test power supply S0. One end of the test valve 1 and one end of the test valve 2 are connected and grounded, and the other end of the test valve 1 and the other end of the test valve 2 are respectively connected with the two sides of the circulating current restraining reactor L01. The secondary winding of the transformer T1 is connected in series with the capacitor CL and then one end is grounded and the other end is connected with any end of the circulating current restraining reactor L01. The primary winding of the transformer T1 is connected in series with the switch K01 and then connected with the AC test power supply S0. A DC voltage component between the converter valve ends is borne by using the capacitor connected in series in the loop, and charging and energy supplementing are performed on the test system by depending on the common transformer without configuring a DC power supply or additionally arranging an energy supplementing valve. A low-power single-phase transformer can be simply used as the transformer or a voltage regulator can be used as the transformer so that the main loop is simple and reliable.

The invention discloses a key awakening circuit. The key awakening circuit comprises a controller, a key detection circuit, a key driving circuit, a city-power powering-down driving circuit, a switch driving circuit and a battery switching switch. The key detection circuit detects the key state and sends the key state to the key driving circuit; the city-power powering-down driving circuit detects the city-power condition and inputs the city-power condition to the key driving circuit and the switch driving circuit; the key driving circuit outputs control signals to the switch driving circuit; the switch driving circuit drives the battery switching switch to work. The invention also provides an awakening method of the key awakening circuit, the awakening method includes the steps of detecting the city-power powering-down state; detecting the key state; detecting battery-switching-circuit control signals; completing circuit awakening. The invention also discloses a meter reading terminal with the key awakening circuit and the awakening method. The key awakening circuit is simple and reliable and extremely low in power dissipation.

The invention discloses a control system of a disc plucker. The control system is characterized in that a PLC (programmable logic controller), a text display as well as buttons with signal lamps are added to an electrical cabinet of the disc plucker, the PLC is adopted as a core for control, falling period and acting time of a beater of the disc plucker are adjusted precisely by a human-computer interface through the text display, a circuit is concise and reliable, working is stable, the period of automatic falling actions and duration of each falling action of the beater of the disc plucker,namely, the falling period and the acting time are adjusted conveniently according to quantity of cotton carding beds, and sufficient mixing and precise gripping are realized; the falling period and the acting time of the beater of the disc plucker are adjusted conveniently according to tightness degrees of new and old cotton bales, labor intensity of an operator is reduced, and equipment accidents are avoided.

The invention discloses an LED drive circuit. A power source Ui is connected with two alternating current input ports of a rectification and filter circuit through a safety resistor R1 and an X capacitor C1, wherein the rectification and filter circuit is formed by a diode D1, a diode D2, a diode D3 and a diode D4. A capacitor C2 is connected between a rectification output positive pole and a rectification output negative pole of the rectification and filter circuit. A collector of an audion Q1 is connected with an output positive pole of the rectification and filter circuit, an emitter of the audion Q1 is connected with a collector of an audion Q2 through a biasing resistor R4, an emitter of the audion Q2 is connected with an output negative pole of the rectification and filter circuit through a biasing resistor R5, a diode D5 and a diode D6 are connected between a base of the audion Q1 and a base of the audion Q2, and between the collector of the audion Q1 and the collector of the audion Q2 respectively, a resistor R2 and a resistor R3 are connected in series, the resistor R2 is connected with the output positive pole of the rectification and filter circuit, and the resistor R3 is connected with the base of the audion Q2. According to the LED drive circuit, control over drive current can be achieved while an expensive IC is not needed; the circuit is simple and reliable and low in cost; discrete components are adopted, therefore, thermal loss is dispersed, and the circuit will be more stable; component diameters are arranged reasonably, and therefore power consumption is lower than that of the IC.

The invention provides a reading circuit for stored data of an electrically programmable fuse wire, and an electronic apparatus. The reading circuit for the stored data of the electrically programmable fuse wire comprises a pulse signal module, an amplifier module and a trigger module, wherein the pulse signal module is connected to the electrically programmable fuse wire and controls switch-on of the electrically programmable fuse wire by utilizing a pulse signal during a reading cycle of the stored data of the electrically programmable fuse wire; the amplifier module is connected to the pulse signal module and amplifies an output signal of the pulse signal module; and the trigger module is connected to the amplifier module to sample an output signal of the amplifier module, and outputs the sampled signal under the control of a clock signal. According to the reading circuit, the time for enabling a current to flow through the electrically programmable fuse wire can be greatly shortened, and the misreading probability caused by soft electro migration is reduced, so that the performance of the electrically programmable fuse wire in HTOL testing is improved.

Provided is a diesel vehicle automatic flameout device, which can realize that the diesel engine is electrified during working, and a flame switch rod can naturally return when the diesel engine is not working; automatic flameout can be realized after triggering a button and power off; and the flameout power source can be automatically closed after flameout.

The invention discloses a fault detection circuit of direct current fans. The fault detection circuit comprises a relay. A pin 3 of the relay is connected with a fault signal, and a pin 6 of the relay is connected with a fault signal ground. One end of a coil of the relay is connected with a power source, and the other end of the coil of the relay is connected with a collector of a triode Q2. An emitter of the triode Q2 is in ground connection, and a base of the triode Q2 is connected with isolation circuits. One isolation circuit comprises an optocoupler U1 and a triode Q1. A secondary pin 4 of the optocoupler U1 is connected with the base of the triode Q2 and the power source, a secondary pin 3 of the optocoupler U1 is in ground connection, a primary pin 1 of the optocoupler U1 is connected with the power source, and a primary pin 2 of the optocoupler U1 is connected with a collector of the triode Q1. An emitter of the triode Q1 is connected with a fan ground, and a base of the triode Q1 is connected with warning circuits. One warning circuit comprises a light emitting diode D1 and a fan warning signal. The characteristics of one-way conduction of light emitting diodes and light emitting achieved after conduction are utilized, the functions of monitoring the states of the fans in real time and outputting an alarm signal are achieved, and the circuit is simple and reliable.

The invention relates to a novel energy-saving control circuit which is characterized by comprising a rectifying and filtering circuit (1), a switch power converting circuit (2), a voltage detecting and processing circuit (3), a load control circuit (4), a current detecting and processing circuit (5), a wireless remote circuit (6) and a main control unit (MCU); the input end of the rectifying and filtering circuit (1) is connected with an alternating current power supply, and the output end is respectively connected with the input ends of the switch power converting circuit (2) and the voltage detecting and processing circuit (3). By detecting and processing alternating input voltage and current, a load switch can be controlled and protected to work normally within a certain power range; by further detecting a voltage, load outputting can be cut off when the voltage of a grid fluctuates, so that electric equipment is protected; the load switch can be switched on in real time by wireless remote. The invention has the beneficial effects of simpleness, stable and reliable performance, easiness for realization and reasonable cost.

The invention relates to a fault automatic detection and repair power supply selection control circuit, and belongs to the field of power supply control. The fault automatic detection and repair power supply selection control circuit is mainly composed of a voltage transformation module, an isolation voltage module, a photoelectric coupling module, a single-chip microcomputer control module and a relay enabling module, and has the characteristics of multi-channel intelligent control, automatic fault detection and repair, stability, reliability, real-time performance, high efficiency, energy conservation, environmental protection and the like which are incomparable with the conventional power supply control circuit; and intelligent power supply and distribution control can be satisfied.

The adjustable DC stabilized power supply circuit includes an adjustable integrated voltage stabilizer, a voltage compensation circuit, and a soft-start circuit. The LM317 series three-terminal integrated voltage stabilizer is used as the adjustable integrated voltage stabilizer. ₄ and diode D to form a voltage compensation circuit, consisting of transistor T, resistor R ₃ , R and capacitor C form a soft-start circuit. The output voltage is continuously adjustable from 0V, the circuit is simple and reliable, and it can output enough current.

The invention relates to a magnetic storage medium degaussing machine with improved performance. The machine comprises a charging circuit, a boost rectification current-limiting circuit connected withthe charging circuit, a degaussing coil connected with the boost rectification current-limiting circuit, and a microprocessor connected with the charging circuit and the degaussing coil. Wherein thecapacitor modules are connected with the boost rectification current-limiting circuit in parallel, and the capacitor voltage acquisition module and the capacitor overcharge protection module are connected with the capacitor modules in parallel. Circuits are reliable, and the magnetic field intensity can be increased only by adding the capacitor module under the condition that the original circuitdesign is not modified; and the product is high in universality, suitable for mass production and low in maintenance cost.

The invention belongs to a power supply circuit, and specifically relates to a low-voltage-drop power supply circuit. The circuit comprises a lithium battery module and a main power module. An outputend of the lithium battery module and an output end of the main power module are connected with a power supply end of an external circuit through a power switching circuit. The power switching circuitincludes a first switching circuit, a second switching circuit and a third switching circuit. The output end of the lithium battery module is connected with the first end of the first switching circuit, and the second end of the first switching circuit is connected with the second end of the second switching circuit and the third end of the third switching circuit. The first end of the second switching circuit is connected with the first end of the third switching circuit, the third end of the second switching circuit is connected with the second end of the third switching circuit, and the second end of the third switch circuit is also connected with the output of the main power module. The low-voltage-drop power supply circuit of the invention can automatically switch the power supply mode between the main power supply and the lithium battery power supply under different working conditions through a pure analog circuit.

The invention discloses a hot-melting welding cutter with a function of enhancing blood vessel sealing. The hot-melting welding cutter comprises a first forceps holder working end provided with an electric heating device, a corresponding second forceps holder working end, a hinge part, a connecting rod, a control handle and a power supply, wherein an exposed tissue cutting electric heating wire is arranged in the center of the working surface of the first forceps holder working end along the longitudinal axis; blood vessel sealing electric heating wires with heat transfer sleeves are arranged on two sides of the tissue cutting electric heating wire respectively; the tissue cutting electric heating wire protrudes outwards relative to the blood vessel sealing electric heating wires; high-temperature-resistant anti-adhesion materials are arranged outside the blood vessel sealing electric heating wires and the heat transfer sleeves; and the tissue cutting electric heating wire and the blood vessel sealing electric heating wires with the heat transfer sleeves are tightly attached to the working surface of the first forceps holder working end and are provided with high-temperature-resistant anti-adhesion insulating layers. The blood vessel sealing area of the clamped tissue is increased, the whole blood vessel sealing and tissue cutting operation is finished by a continuous action through the action of pressurized hot-melting welding, and the hot-melting welding cutter is simple, rapid and efficient and has an effect of preventing cutter head adhesion.

A continuous casting ladle sliding nozzle hydraulic transmission system, which consists of a pressure-adjustable electro-hydraulic source, an emergency hydraulic source, a three-position four-way H-type neutral function manual reversing valve, an oil filter device, a quick connector, a hose, and a working Oil cylinder composition. The pressure oil provided by the electro-hydraulic source passes through the interface A of the H-type mid-position function manual directional valve, passes through the two-position directional valve, and then goes through the oil filter device, quick connector, and hose to the rodless chamber in the working cylinder to realize sliding. The water port is closed; the pressure oil goes to the rod cavity in the working cylinder through the interface B, the oil filter device, the quick connector and the hose, and the piston rod is pushed to realize the opening of the sliding water port. The H-type neutral function manual reversing valve can release the pressure by itself when it returns to the neutral position, which is beneficial to the connection of the quick joint. In the event of a power failure in an unexpected situation, you only need to shake the handle of the emergency hydraulic source repeatedly to automatically cut off the electro-hydraulic source. The emergency hydraulic source provides pressure oil to the rodless cavity in the working cylinder, and the sliding nozzle can also be closed to avoid the accident of molten steel loss and burning equipment.

The invention provides a motor drive device and a motor assembly employing the same and a load drive device. The motor drive device includes a variable frequency control circuit, a bridge circuit anda chopping circuit. A synchronization circuit is connected to an AC power source through the bridge circuit and the chopping circuit. When the synchronization motor is in a synchronous operation state, the variable frequency control circuit controls the connection or the disconnection of the chopping circuit so as to control motor current and, at the same time, transmits variable frequency speedregulation signals so as to control a first and a fourth bidirectional electronic switch and a second and a third bidirectional electronic switch of the bridge circuit to connect in an alternating manner, so that variable frequency speed regulation of the motor is realized. The above motor drive device has a large start torque and is good in torque coherence, and can operate at a speed higher thanthe synchronization speed.

The invention discloses a rotating speed detection device and method for a magnetic suspension high-speed motor. The device comprises a rotor, wherein the periphery of the rotor is sleeved with a bearing pedestal and an axial displacement detection disc, a rotating speed and rotating direction monitoring sleeve is disposed between the bearing pedestal and the axial displacement detection disc, the rotating speed and rotating direction monitoring sleeve is disposed on the periphery of the rotor in a sleeving manner, an axial displacement sensor component sleeves the periphery of the rotating speed and rotating direction monitoring sleeve, the axial displacement sensor component is fixed on the bearing pedestal, a groove is formed in the outer circle of the rotor, the axial displacement sensor component is used for measuring the distance between the axial displacement sensor component and the outer circle of the rotor and outputting a position signal, and a signal line of the axial displacement sensor component is connected with a main control chip DSP of the magnetic suspension high-speed motor through a signal conditioning circuit. The main control chip DSP of the magnetic suspension high-speed motor processes square wave signals output by the signal conditioning circuit to obtain the rotating speed and the rotating direction of the magnetic suspension high-speed motor, and the device has the advantages of being simple and reliable in structure and circuit and low in cost.

The invention provides a constant current and inverse pole control driving method and system for a water electrolysis module; the system comprises an MCU controller which is connected with a power supply polarity conversion unit and a PWM driving unit, the power supply polarity conversion unit is connected with a load, and the load is connected with the MCU controller through a current A/D feedback unit; the PWM driving unit is connected with and drives the power supply polarity conversion unit; and the power supply polarity conversion unit and the MCU controller are respectively connected with the power supply unit. Herein, PWM signals are output through the MCU to control combination of output voltage and current signal A/D conversion detection feedback to form a closed-loop adjusting circuit, and therefore constant-current output is achieved. According to the power-off pole inversion function, the memory function of the MCU EEPROM is utilized to realize the memory of the power supply polarity each time, so that the polarity conversion of the H-bridge chip is controlled by utilizing the I/O port, and the pole inversion function after power off is realized. Therefore, circuit accuracy can be less than or equal to 1%, the power supply efficiency can be greater than or equal to 75%, and the power-off pole inversion function is realized.

The invention relates to an anti-floating charge protection circuit for a spaceflight lithium battery. The anti-floating charge protection circuit comprises a main power charging circuit, a charging termination circuit, a charging unlocking circuit and an execution circuit. In a spaceflight power supply system, a lithium battery is charged by adopting a mode of first constant current and then constant voltage, when a storage battery is converted from constant current charging to constant voltage charging, the battery voltage is gradually increased, the charging current is gradually reduced but does not reach zero, when the charging current is less than a charging termination current threshold value, a charging allowing signal in an execution circuit is turned into a low level, a charging switch tube is turned off, charging is stopped at the moment, and the charging current is zero; when the lithium battery is discharged and the voltage of the battery is lower than the unlocking voltage, the charging allowing signal is turned into a high level, the charging is unlocked, and the PWM signal drives the charging switch tube to charge the battery. According to the invention, the charging and discharging management of the lithium battery can be carried out without additionally controlling a lower computer, the functions of automatically stopping charging and recovering charge of the lithium battery can be realized, the floating charging of the lithium battery can be avoided, and the service life of the lithium battery can be prolonged.

The invention discloses a balance bus management circuit of an energy transfer type series battery pack and a management method of the balance bus management circuit. The circuit comprises a balance bus, a load terminated line, a source terminated line, a first bidirectional dc/dc converter, single batteries, a balance resistor, a second bidirectional dc/dc converter and a third bidirectional dc/dc converter; the balance bus is positioned on the right side of the balance resistor; the load terminated line and the source terminated line are connected through the second bidirectional dc/dc converter; the source terminated line is positioned on the left side of the second bidirectional dc/dc converter; the first bidirectional dc/dc converter and the balance bus are connected through the balance resistor; and the single batteries and the second bidirectional dc/dc converter are connected through the source terminated line; and the balance resistor is positioned on the right side of the first bidirectional dc/dc converter. By virtue of the balance bus management circuit and the management method, dynamic energy transfer is realized, the system energy use efficiency is improved, the balance circuit is simple and reliable, and balance can be realized more easily.