34results about How to "Achieving Soft Shutdown" patented technology

The invention discloses a boost type converter for realizing high-gain voltage multiplication by coupling inductors, comprising two switching tubes, two clamping diodes, a freewheel diode, an output diode, a clamping capacitor, a voltage-multiplying capacitor, an output capacitor and two coupling inductors respectively provided with two windings. The two coupling inductors are utilized to improve the gain of the converter and reduce the voltage stress of the switching tubes and the diodes in the converter, and the leakage inductance of the coupling inductors is utilized to realize the zero current turn-on of the switching tubes and the soft turn-off of the diodes. A clamping circuit consisting of the clamping diodes and the clamping capacitor absorbs a switching tube turn-off voltage spike caused by the leakage inductance and realizes the lossless transfer of energy. A voltage-multiplying circuit is utilized to further improve the gain of the converter and reduce the voltage stress of the switching tubes and the output diode, and staggered parallel connection is utilized to control and reduce ripple waves of input current.

The invention discloses a motor soft-starting method of a soymilk machine. Controlled silicon is used as a booster that is connected between a power supply and an electric motor; in AC with T period, an AC zero-crossing signal is detected and taken as a sync signal, the conduction angle magnitude is changed in a phase-shift trigger manner, so that the electric motor obtains voltage that varies continuously. The motor soft-starting method really realizes the soft-starting and soft turning-off of the electric motor in the soymilk machine, reduces the impact of sudden increase and sudden decrease of the voltage on the electric motor and a power grid, leads the rotation speed of the electric motor in the soymilk machine to change smoothly when starting or turning off, reduces the impact torque of the electric motor on loaded machinery, increases the operating stability of the soymilk machine, and prolongs the service life of the electric motor.

The invention is a flow measuring and control method for measurable and controllable electromagnetic valves, belonging to the automation technical field. And the invention firstly makes measurable and controllable flow electromagnetic valve, signal processing controller and power switch compose a flow measuring and control system, where the measurable and controllable flow electromagnetic valve transmits pressure difference between upper and lower valve fluids to the pressure input port of a pressure difference sensor so that the fluid pressure difference is converted through the pressure difference sensor into fluid pressure difference electric signal to output to the input end of the signal processing controller, the signal processing controller calculates the current detected flow according to the input fluid pressure difference and the output current of an electrified coil and compares it with the given flow to output control instruction to change the current of the electrified coil so as to control the valve opening and achieve the purpose of flow control. And the invention implements integration of flow measurement and control, and can conveniently control regulating rule of the valve opening by algorithm.

The invention relates to an intelligent electric power regulator and a method for uniformly allocating power. The power regulator comprises a microprocessor, an input device, an output device and a TCP/IP protocol-based bidirectional communication interface, wherein the input device and the output device are connected with the microprocessor; the input device comprises an analogue input interface circuit, a load current detection circuit and a radiator temperature detection circuit; the analogue input interface circuit is connected to an input port and connected with an intelligent instrument; the output device comprises a thyristor and a driving module of the thyristor; the communication interface module comprises an Ethernet controller, a physical layer interface and an optical fiber communication interface; the micro-processor is also connected with a load current detection module and an overload and short circuit protection module; and the power regulator realizes uniform allocation of load power as well as soft start and switch-off functions by adopting a power adjusting algorithm. The power regulator can run alone as well as run together with other power regulators in a network, realize remote communication control and prolong the service life of a heating element, and has a compact structure, low system cost and high control accuracy.

The invention discloses a high-gain active lossless clamping converter including a built-in transformer and a voltage-multiplying structure. The high-gain active lossless clamping converter comprises one input inductor, one power switch tube, one clamping switch tube, two voltage-multiplying diodes, two output diodes, one clamping capacitor, one DC (Direct Current) blocking capacitor, two voltage-multiplying capacitors, two output capacitors and the built-in transformer, wherein the built-in transformer is provided with two windings. According to the high-gain active lossless clamping converter disclosed by the invention, the built-in transformer is utilized for expanding the voltage gain of the high-gain active lossless clamping converter and reducing the voltage stress of the power switch tube, the leakage inductance of the built-in transformer is utilized for realizing zero-voltage switching of the switch tubes and restraining inverse restoring current of the diodes, a clamping circuit formed by the clamping switch tube and the clamping capacitor is capable of effectively absorbing the voltage spike when the power switch tube is switched off and realizing the lossless transfer of energy, a voltage-multiplying circuit structure is utilized for further increasing the gain of the high-gain active lossless clamping converter and further reducing the voltage stress of the power switch tube and the diodes, the circuit structure is simple, the control is convenient, and the high-gain active lossless clamping converter is suitable for a photovoltaic grid-connected power generation conversion occasion in small power, high gain and high efficiency.

The invention discloses a Boost converter with a built-in transformer and a voltage-doubling unit of a switching capacitor, which comprises a power switching tube, an input filtering inductor, a blocking capacitor, a clamping diode, a clamping capacitor, a fly-wheel diode, the switching capacitor, an output diode, an output capacitor and a built-in transformer with two windings. The leakage inductance of the built-in transformer is utilized for realizing zero-current switching-on of the power switching tube and eliminating the backward recovery problem of the output diode and the clamping diode, a passive clamping circuit comprising the clamping diode and the clamping capacitor is utilized for realizing soft switching-off of the power switching tube and non-loss transfer of leakage inductance energy, the leakage inductance and resonance of the blocking capacitor are utilized for eliminating the backward recovery problem of the fly-wheel diode, the voltage-doubling unit comprising the built-in transformer and the blocking capacitor is utilized for realizing high-gain output of the converter and reducing the voltage stress of a power device, an additional power switch is not required, no energy loss elements exist in a circuit, and the structure is simple.

The invention relates to a power factor corrector realized in an intelligent embedded way and a control method thereof. The power factor corrector comprises a PFC (Power Factor Correction) processor with an embedded chip as core, a full wave rectifying circuit, an overcurrent protection circuit, a double-limiting voltage control circuit, a DC/DC (Direct Current/Direct Current) conversion circuit, an inductor L, a diode D, a capacitor C and a power switch tube Q. The power factor corrector realized in the intelligent embedded way, provided by the invention, has the advantages as follows: 1) duty cycle is directly stored in a chip in the form of data so as to output a PWM (Pulse Width Modulation) control wave, so that the traditional feedback circuit method is saved, a circuit structure is simplified, the usage of components is reduced and the processing process is simple and convenient; 2) the processor can be used for adjusting programs according to actual requirements in real time without frequently modifying hardware; 3) a voltage constant output function is achieved and load requirements are satisfied; 4) a remote control voltage regulating function is achieved, so that greater convenience for user in use is achieved; 5) soft startup and soft shutdown of a circuit are achieved and a circuit component is protected; and 6) overcurrent protection is achieved so that the safety of the circuit is ensured.

The invention discloses a high-gain active lossless clamping interleaving converter with an internal transformer and a voltage-multiplying structure. The high-gain active lossless clamping interleaving converter comprises two input inductors, two power switching tubes, two clamping switching tubes, two voltage-multiplying diodes, two output diodes, two clamping capacitors, two voltage-multiplying capacitors, two output capacitors and one internal transformer with three windings. According to the invention, a voltage gain of the converter is expanded and voltage stresses of the power switching tubes and the diodes are reduced by the internal transformer; the leakage inductance of the internal transformer is utilized to implement zero voltage switching of the switching tubes and inhibit reverse recovery currents of the diodes; a clamping circuit consisting of the clamping switching tubes and the clamping capacitors effectively adsorbs a voltage spike when the power switching tubes are switched on and switched off and implements lossless transfer of energy; the voltage-multiplying circuit structure is utilized to further improve the gain of the converter and further reduce the voltage stresses of the power switching tubes and the diodes; the high-gain active lossless clamping interleaving converter has a simple circuit structure, is convenient to control and is suitable for the high-gain and high-efficiency grid-connected photovoltaic power generation transformation place.

The invention relates to a single-phase X-shaped staggering three-level AC voltage regulating circuit including a main circuit part and a switch tube protection part. The main circuit part includes a power source Ui, an inductor Li, an inductor Lo, a capacitor C1, a capacitor C2, a capacitor C, an IGBT switch tube S1, an IGBT switch tube S2, an IGBT switch tube S3, an IGBT switch tube S4, an IGBT switch tube S5, an IGBT switch tube S6, a diode D1, a diode D2, a diode D3, a diode D4, a diode D01, a diode D02, a diode D03, a diode D04, a diode D05, a diode D06, a diode D07, a diode D08 and a resistor R. The switch tube protection part includes an inductor Lr, a capacitor Cr and a capacitor CS. The quantity of involved components and parts is small and the cost is low. The structure of the voltage regulating conversion circuit is simple. Reverse phase voltage adjustment of input and output can be realized. The circuit provided by the invention has advantages of single-stage conversion, small quantity of output voltage harmonics, low voltage stress and large output voltage regulation range.

The present invention discloses a three-phase inverter short-circuit fault detection method. The method comprises: collecting a line voltage in a three-phase inverter and converting the line voltage into a phase voltage; performing DQ decoupling processing on the line voltage and the phase voltage to obtain active component detection values, reactive component detection values, and zero sequence component detection values respectively corresponding to the line voltage and the phase voltage; setting active component standard values, reactive component standard values, and zero sequence component standard values respectively corresponding to the line voltage and the phase voltage during the normal operation of the three-phase inverter according to the specific inverter; comparing the detection values corresponding to the line voltage with the corresponding standard values, and the detection values corresponding to the phase voltage with the corresponding standard values, and determining whether there is a fault to the three-phase inverter according to the comparison results; if there is no fault, allowing the three-phase inverter to continue to operate; if there is a fault, determining a fault occurrence position according to the phase voltage and the line voltage and the corresponding detection values; and according to the fault occurrence position, executing pulse blocking protection on the switch or disconnecting a main contactor to stop the inverter operation, and ending the test.

A dual-unit step-up type soft switch converter is composed of two powr diodes, two resonance circuits, and an auxilairy switch. The soft cut-off of auxiliary switch, the soft on-off of power diode and zero-current cut-off of output rectifying diode are realized on the basis that two resonance capacitors whose voltage can not change suddenly and used.

Embodiments of the invention disclose an overtemperature protection circuit and a driving method. The overtemperature protection circuit comprises a constant current source circuit, a comparator circuit and an output circuit, wherein the comparator circuit comprises a negative temperature coefficient resistor, a first resistor and a voltage comparator; the comparator circuit compares a first voltage end at the first input end and a second voltage value at the second input end, and outputs a control signal according to a comparison result, wherein when the temperature is greater than or equal to a protection threshold value, the control signal is an overtemperature control signal; and the output circuit is used for outputting a switch-off enabling signal when the comparator circuit outputs the overtemperature control signal. By virtue of the scheme provided by the embodiment, a device can be switched off in time at an overhigh temperature so as to protect the device.

The invention relates to a driving voltage regulating circuit, a driving circuit and a driving method of a power electronic device. The driving voltage regulating circuit comprises a time constant regulating circuit and a pulse modulation control circuit, wherein the pulse modulation control circuit is used for outputting a pulse signal to the power supply circuit, and the pulse signal is used for driving the power supply circuit to output a driving signal to the time constant adjusting circuit; slopes of a driving signal level rising edge and a driving signal level falling edge are adjusted through a time constant adjusting circuit so as to output a driving level with a voltage value slowly changing at the driving signal level rising edge or the driving signal level falling edge, and on or off of a power electronic device is controlled through the driving level. Soft turn-on and soft turn-off are realized based on the driving voltage adjusting circuit and the driving circuit, so that a peak voltage value is effectively reduced, a power electronic device is prevented from being broken down by peak voltage high voltage, and the reliability of an electronic product is improved.