865 results about "Converter circuit" patented technology

The invention is suitable for the technical field of resonant converters, and provides a starting control circuit and a resonant converter. The starting control circuit comprises a feedback module, a comparison selection module and a logical operation module, the comparison selection module is electrically connected with the feedback module and the logical operation module, the feedback module is used for being electrically connected with the output end of a resonant conversion circuit in the resonant converter, and the logical operation module is used for being electrically connected with a driving circuit in the resonant converter. According to the starting control circuit provided by the embodiment of the invention, the resonant capacitor voltage constraint threshold value which is gradually enlarged along with the starting process can be constructed, smooth establishment of resonant capacitor direct current bias is realized, the fluctuation amplitude of the resonant capacitor voltage is limited, the problem that the total bus voltage is applied to the resonant inductor in a traditional scheme is avoided, and the starting control circuit is suitable for a high-voltage power supply. Finally, the resonance current peak value in the starting stage is effectively suppressed, and the impact of current stress on core devices such as a switching tube and a resonance inductor is reduced.

The invention discloses a battery pack activity heat recovery control method for a low-temperature environment, and particularly relates to the technical field of battery activity heat recovery control, and the method comprises the steps: deploying a sensor for a target battery pack, carrying out the monomer division of the battery pack, and collecting the parameter data of each battery pack monomer in real time; preprocessing the collected battery pack monomer parameter data, and setting a threshold value; generating a heat recovery starting instruction; generating a low-frequency alternating-current excitation signal; controlling a power conversion circuit according to the low-frequency alternating-current excitation signal, and outputting alternating current for battery pack thermal recovery; and generating a thermal recovery stop instruction according to the limitation condition of the battery pack monomer. According to the method, the problems of low heat efficiency, poor safety, insufficient control precision, weak adaptability and the like in the battery heat recovery process are solved by collecting the parameter data of the single battery pack, setting the threshold value, generating the heat recovery starting instruction, calculating the joule heat generated by the current and generating the heat recovery stopping instruction according to the limiting condition.

The single-phase bidirectional single-stage isolation matrix converter comprises a pre-stage circuit and a post-stage circuit, and the pre-stage circuit comprises an LC filter on the power grid side, a pre-stage single-phase matrix conversion circuit and an LLC resonance circuit with a high-frequency transformer; the post-stage circuit comprises a post-stage conversion circuit and an output filter capacitor; the front-stage single-phase matrix conversion circuit comprises four bidirectional switch assemblies of a full-bridge structure. Each bidirectional switch assembly comprises two unidirectional controllable MOS tubes which are reversely connected in series, one end of each bidirectional switch assembly is connected to an L line or an N line of a power grid, and the other end of each bidirectional switch assembly is connected to the LLC resonance circuit. The rear-stage conversion circuit comprises a bidirectional MOS (Metal Oxide Semiconductor) tube bridge circuit and three high-frequency transformer secondary windings which are in triangular connection or star connection; and two end points of each secondary winding are respectively connected to the upper MOS tube and the lower MOS tube of the corresponding bridge arm and then are connected to output positive and negative ends. The converter has the advantages of high power density, low current harmonic, high power factor and the like, and is small in size, strong in anti-interference capability, wide in buck-boost range, and safe and reliable in commutation.

The present application relates to high speed, high efficiency SiC power modules. A power converter module includes an active metal brazing (AMB) substrate, a power converter circuit, and an enclosure. The AMB substrate includes an aluminum nitride base layer, a first conductive layer on a first surface of the aluminum nitride base layer, and a second conductive layer on a second surface of the aluminum nitride base layer opposite the first surface. The power converter circuit includes a plurality of silicon carbide switching components coupled to each other via the first conductive layer. The enclosure is disposed over the power converter circuit and the AMB substrate. By using an AMB substrate with an aluminum nitride base layer, thermal dissipation of the power converter module can be significantly improved while maintaining structural integrity of the power converter module.

The application discloses a single-stage three-phase high-frequency isolation type conversion circuit and a closed-loop control method. The single-stage three-phase high-frequency isolation type conversion circuit generates a modulation ratio and a vector angle on the basis of synchronous control of a fundamental wave and a harmonic wave of a three-phase current based on three-phase voltage of a three-phase three-wire power grid and the three-phase current of the three-phase three-wire power grid, generates a primary side driving signal and a secondary side driving signal according to the modulation ratio and the vector angle, the primary side driving signal is used for driving a three-phase matrix converter, and the secondary side driving signal is used for driving a full-bridge inverter. The fundamental wave and the low-frequency harmonic wave of the power grid current can be synchronously controlled, low-order harmonics can be eliminated, the sinusoidal degree of the grid-connected current can be improved, and thus the quality of the power grid current and total harmonic distortion can be improved.

The invention provides a DC-DC forward boost-buck power conversion circuit based on cascaded Cuk topologies, and relates to the technical field of power electronic conversion, the circuit is mainly formed by cascading two Cuk topologies sharing one inductor, and the circuit also comprises a power supply end, a load end and a same-frequency driving signal generator. The same-frequency driving signal generator controls the two power switch tubes in the Cuk topology through a same-frequency signal, and the output voltage is adjusted by adjusting the duty ratio. The circuit not only keeps the advantage of continuous input and output current of a traditional Cuk circuit, but also converts the polarity of the output voltage from the reverse direction to the forward direction, and meanwhile, the voltage gain is remarkably improved, so that forward voltage conversion can be efficiently and smoothly realized. The circuit structure has the characteristics of high gain, forward output, continuous current, simple control and the like, and is suitable for occasions requiring high-efficiency and high-quality electric energy conversion, such as new energy power generation and energy storage, electric automobiles, precision industry and the like.

The invention provides an insulation detection method and device of a photovoltaic system, a controller and the photovoltaic system. The method comprises the following steps: detecting whether the photovoltaic system has an insulation fault; if the photovoltaic system has the insulation fault, determining the position of the insulation fault in the fault photovoltaic string according to the ratio of the voltage to ground of the first pole of the photovoltaic system to the open-circuit voltage of the photovoltaic string; the first electrode is any one of a direct-current bus positive electrode and a direct-current bus negative electrode; and respectively and independently controlling the positive and negative electrodes of the input end of each direct current conversion circuit to be short-circuited, and for each MPPT module, determining whether the insulation fault position is located in the MPPT module based on the change of the voltage to ground of the first electrode before and after the short circuit of the MPPT module. According to the photovoltaic system insulation fault detection method and the photovoltaic system insulation fault detection device, insulation faults from a system level to a component level can be spanned, additional devices are not needed, manpower, time and economic cost required by field troubleshooting is reduced, and the detection efficiency of the photovoltaic system insulation faults is improved.

The invention relates to a relay detection method applied to a power conversion device. The method comprises the following steps: outputting a first driving signal to the power conversion circuit, wherein the first driving signal is used for controlling the power conversion circuit to output power to the first live wire output end; acquiring a first inverter voltage of the output end of the first live wire; under the condition that the first inversion voltage reaches the target voltage, the zero line relay and the first live wire relay are controlled to be closed; after the zero line relay and the first live wire relay are closed, stopping outputting the first driving signal; and obtaining a first network side voltage of the first live wire input end and a first inversion voltage of the first live wire output end to determine fault detection results of the zero line relay and the first live wire relay. According to the method, faults of the zero line relay and the first live wire relay of the power conversion circuit can be correctly detected, and the reliability of the power conversion circuit is greatly improved.

The invention provides an isolation conversion circuit, an isolation conversion circuit control method, a controller and a vehicle-mounted charger. The isolation conversion circuit comprises a transformer isolation assembly which comprises a primary winding and a secondary winding, and the primary winding is provided with a first end, a second end and a primary tap arranged between the first end of the primary winding and the second end of the primary winding; the primary side bridge arm switching circuit is respectively connected with the power supply end, the first end of the primary side winding and the second end of the primary side winding; a secondary bridge arm switching circuit; the first switching circuit is respectively connected with the power supply end and the primary side tap and is used for connecting / disconnecting a path between the power supply end and the primary side tap; when the first switching circuit is in a conducting state, the primary side bridge arm switching circuit is used for carrying out push-pull on the voltage of the power supply end through the first switching circuit and then carrying out inversion output; and when the first switching circuit is in the off state, the primary side bridge arm switching circuit is used for inverting and outputting the voltage of the power supply end. The invention aims to reduce the size of the whole machine.

A multiphase LLC resonant converter of N phases (N represents an integer equal to or more than two) causes N resonant converters connected in parallel to a direct current power supply to operate with a phase difference of 360° / N. One of the resonant converters includes a lower adjustment inductor connected in parallel with primary windings of the lower conversion circuits. The one of the resonant converters includes an upper adjustment inductor connected in parallel with primary windings of upper conversion circuits. Outputs including high potential output terminals and low potential output terminals of the lower conversion circuits and the upper conversion circuits star connected at neutral points via a second resonant capacitor are connected.

A power supply includes a converter circuit, a switching circuit and a control circuit. The converter circuit includes a transformer, a primary side switch and a secondary side switch. The switching circuit includes first and second capacitors, first and second sets of switches. In a first phase, the primary side switch is in the conduction state, causing a magnetizing inductor of the transformer to store energy. In a second phase, the primary side switch is in the off state, causing the magnetizing inductor to release the energy. In a first mode of the second phase, a first amount of the energy is transferred through the first set of switches to the first capacitor. In a second mode of the second phase, a second amount of energy is transferred to the second capacitor through the second set of switches.

The invention relates to a lighting system for a motor vehicle. The present invention provides an apparatus and a method that enable the efficiency of a converter to be improved depending on changes in the load of the converter. This is accomplished by using a synchronous converter circuit instead of an asynchronous converter typically used for automotive lighting applications.

An imaging circuit arrangement is provided, comprising a column of image pixels coupled to a pixel output line, a first data converter circuit with an input coupled to the pixel output line and configured to output a first bit set, an integrator with an input coupled to the first data converter, and a second data converter circuit with an input coupled to the integrator and configured to output a second bit set. The first data converter circuit can be an analog-to-digital converter with a successive approximation register. The integrator can include an amplifier for charging an integrating capacitor. The second bit set can be scaled based on a calibrated value before being combined with the first bit set.

The invention discloses a power conversion unit, a power conversion method and shore-based power supply equipment, and relates to the technical field of submarine cable fault localization, and the power conversion unit comprises a DC conversion circuit, a resonant transformation circuit, a rectification filter circuit, a drive circuit and a controller. The direct current conversion circuit, the resonance transformation circuit and the rectification filter circuit are connected, the driving circuit is connected with the controller, the direct current conversion circuit and the resonance transformation circuit, and the controller is configured to generate a PWM signal according to a submarine cable power supply instruction when submarine cable power supply is carried out, and output the generated PWM signal to the driving circuit to drive the direct current conversion circuit and the resonance transformation circuit. The rectification filter circuit outputs direct current to the submarine cable; and when submarine cable fault positioning detection is carried out, an SPWM signal is generated according to a submarine cable detection instruction, the generated SPWM signal and the PWM signal are superposed and then output to the driving circuit, and the rectification filter circuit is enabled to superpose and output alternating current with preset parameters while outputting direct current. The power-off maintenance time of the submarine cable is shortened, and the economic loss is reduced.

A malfunction of an upper arm switching element, caused when an output of a power converter circuit assumes a negative potential and undershoots, is prevented. An upper arm driver circuit comprises: a first switching element SW1, which is connected between a gate and a reference potential terminal of an upper arm switching element Q1; a second switching element SW2, which has a drain that is connected to a gate of the first switching element SW1;and a potential control circuit 4, and the potential control circuit 4 performs a control to make a potential of a source of the second switching element SW2 to a first potential V1 at which the first switching element SW1 can be kept in an on state even if the second switching element SW2 is switched on due to a malfunction in a first period T1, during which at least the reference potential terminal of the upper arm switching element Q1 is a negative potential and causes an undershoot AND, and to make the potential of the source of the second switching element SW2 to a second potential V2 that is lower than the first potential V1 and at which the first switching element SW1 can be switched off when the second switching element SW2 is switched on in a subsequent second period T2.

The invention relates to the technical field of power electronics, in particular to a direct current conversion circuit, a switching control method and a power converter. The DC conversion circuit comprises a filter inductor and N power conversion modules. The first end of the filter inductor is used for being connected with the positive electrode of a medium-voltage direct-current power grid. Each power conversion module comprises a half-bridge unit and a direct-current conversion unit, the output end of the half-bridge unit is connected with the input end of the direct-current conversion unit, the first input end after the input ends of the N half-bridge units are cascaded is connected with the second end of the filter inductor, and the second input end after the N half-bridge units are cascaded is used for being connected with the negative electrode of a medium-voltage direct-current power grid; the output ends of the N DC conversion units are used for connecting a low-voltage DC power grid. The N power conversion modules are cascaded in the form of input series connection and output parallel connection, and the cascaded voltage of the medium-voltage side can be adjusted through the half-bridge unit, so that the voltage division adjustment of the single power conversion module is realized, the voltage withstanding requirement of a single tube can be reduced, and the stability of the circuit is improved.

The invention provides a power supply system. The power supply system comprises a direct current bus, an AC-DC conversion circuit, a load circuit, an energy storage unit and a partial power conversion circuit, the AC-DC conversion circuit converts an AC voltage into a DC bus voltage. When the energy storage unit discharges to the direct current bus, the partial power conversion circuit directly transmits a first part of the electric energy provided by the energy storage unit to the direct current bus, converts a second part of the electric energy provided by the energy storage unit and transmits the converted second part to the direct current bus. When the energy storage unit is charged by the direct-current bus, the partial power conversion circuit directly transmits a first part of electric energy provided by the direct-current bus to the energy storage unit, converts a second part of the electric energy provided by the direct-current bus and transmits the converted second part to the energy storage unit. Therefore, the voltage of the direct-current bus is kept stable.

The invention provides a control method of a conversion circuit and a related device. Relates to the technical field of power electronics. The conversion circuit comprises an ACAC circuit, an isolation conversion unit and an ACDC circuit which are connected in sequence. The method comprises the following steps: controlling a first sub-switch of a first switch to be conducted ahead of a first sub-switch of a fourth switch at a first moment; at a second moment after the first moment, if the number of times that the alternating voltage crosses the zero point is an even number greater than or equal to 2, controlling a first sub-switch of the fourth switch to be conducted ahead of a first sub-switch of the first switch; and / or, the fifth switch is controlled to be conducted ahead of the eighth switch at the first moment; at a second moment after the first moment, if the number of times that the alternating voltage crosses the zero point is an integer greater than or equal to 1, controlling the eighth switch to be switched on ahead of the fifth switch; wherein the first moment and the second moment are both zero crossing point moments of the alternating voltage. The thermal balance of the power devices can be realized by controlling the power devices of the bridge arms through the method.

The invention provides a CT energy-taking power supply circuit with self-adaptive output power, and relates to the technical field of power electronics, and the circuit comprises an energy-taking input protection module which is used for obtaining alternating current from a CT induction coil; the rectifying and filtering module is used for rectifying alternating current into pulsating direct current, and the pulsating direct current is smoothed by a filtering capacitor and then provides stable direct-current bus voltage for a post-stage conversion circuit; the DC-DC conversion module is used for efficiently converting the direct-current bus voltage into isolated direct-current voltage suitable for a load; the multi-stage adaptive feedback module is used for dynamically adjusting an output current reference through multi-stage voltage comparison and an optocoupler feedback network, so that the output power is adaptively matched with the CT energy taking size; and the direct current output module is used for rectifying and filtering the converted voltage and providing stable and low-ripple direct current output. According to the technical scheme, the output power is self-adapted according to the magnitude of the CT output electric energy, and the reliability and stability of power supply of the load equipment are improved.

The invention provides a power converter, a photovoltaic system and an active bypass method of a photovoltaic module, an active switch is adopted to replace a bypass diode in a photovoltaic junction box, and an active bypass function is merged into the power converter to save cost. Moreover, the bypass condition is monitored in cooperation with related control logic, the switching tube is switched on when the bypass function needs to be executed, the working loss of a bypass device is reduced, and the purpose of reducing bypass heat consumption is achieved. The controller recognizes whether the battery string is shielded or not by changing the on-off state of the switch in a mode of applying disturbance to the working state of the connected battery string and comparing the voltage difference between the positive input end and the negative input end of the power conversion circuit under the condition that disturbance exists or not, and then controls whether the switch enters a bypass working state or not based on a detection result. And after the control switch is in the conducting state for a set duration, disturbance is applied to the working state of the connected battery string again to monitor whether the battery string is unblocked or not and whether the switch needs to exit the bypass mechanism or not.

The invention discloses an LVDS (Low Voltage Differential Signaling) receiving circuit with a wide common-mode input range. The LVDS receiving circuit comprises a common-mode conversion circuit, a main comparator circuit, a secondary comparison circuit and a logical judgment circuit, the common-mode conversion circuit is used for converting an external wide common-mode input differential signal into a signal with constant common-mode voltage and no attenuation of the differential signal; the main comparator circuit identifies the converted differential signal to complete differential-to-single-ended data conversion; the secondary comparator circuit is composed of two low-speed comparators; and the logic judgment circuit judges the output of the main comparator and the window comparator to ensure that the output of the input end of the circuit group is a constant level under the short circuit and disconnection conditions, so that the function of dynamic failure protection of the circuit is realized. The wide common-mode input circuit can realize discrimination of wide common-mode input signals ranging from-4V to 5V, and has a dynamic failure protection function.

The invention relates to a converter circuit and electronic equipment. The converter circuit comprises an active clamping circuit, a control circuit and a voltage stabilizing circuit, active devices in the active clamping circuit are controlled through the active clamping circuit to realize soft switching, that is, a first switching tube and a second switching tube are controlled to realize soft switching, so that the conduction loss of the first switching tube and the second switching tube is reduced, and the switching efficiency is improved. The problem that large loss is caused when the PFC converter works at high frequency due to the fact that an existing passive clamping circuit cannot achieve soft switching is solved.

The utility model discloses a flyback converter. The flyback converter comprises an input circuit, a primary side control and power conversion circuit and an output circuit, wherein the output circuit comprises an output winding; wherein the input circuit is used for converting alternating current voltage into direct current voltage; the primary side control and power conversion circuit is used for performing power conversion on the direct-current voltage; the output circuit is used for sensing to obtain the voltage after power conversion and outputting the voltage; wherein the primary side control and power conversion circuit comprises a first primary side main winding, a power switch and a second primary side main winding; when the power switch is closed, the first primary side main winding and the second primary side main winding are connected in series through the power switch; and the first primary side main winding, the second primary side main winding and the output winding form a transformer. By adopting the scheme, the electromagnetic interference of the flyback converter can be reduced.

The invention discloses a discharging control method, a power module and a charging system, and relates to the technical field of charging, the discharging control method is applied to the power module, the power module comprises a DC / DC conversion circuit, the DC / DC conversion circuit comprises at least one group of resonant power conversion loops, each resonant power conversion loop comprises a first power conversion module and a second power conversion module, the method is performed by a controller, the controller comprising a regulation loop, the method comprising: in the event of a power module shutdown, determining a first phase and a second phase based on a discharge demand; and under the condition that the first power conversion module discharges according to the first phase and the second power conversion module discharges according to the second phase, the first phase and the second phase are adjusted based on the electrical parameters and the adjusting loop, so that the DC / DC conversion circuit discharges normally. Therefore, self-discharge without an external discharge circuit can be realized, the cost and the size are saved, and the capacitor voltage is released through the loss of energy circulation in the circuit.

A DC:DC converter includes: a DC:AC converter circuit having DC and AC sides; an AC:DC converter circuit having DC and sides; an AC link connecting the AC side of the DC:AC circuit and the AC side of the AC:DC converter circuit, the AC link including a transformer having a first winding connected to the AC side of the DC:AC converter circuit and a second winding connected to the AC side of the AC:DC converter; a capacitor; and a switch arrangement having a first state and a second state, wherein: in the first state, the capacitor is connected in series between the AC side of the DC:AC converter circuit and the first winding of the transformer; and in the second state, there is a current path between the AC side of the DC:AC converter circuit and the first winding of the transformer that does not include the capacitor.

The application relates to a satellite energy acquisition system based on space charged particle collection, belonging to the technical field of spacecraft power supply. The application aims at solving the problem that the discharge phenomenon of the space charged particles deposited on the surface of a satellite can cause physical damage to materials. The application comprises a collection capacitor used for capturing the space charged particles, forming a high-voltage electrostatic field through the accumulated charges of the space charged particles; an energy-taking conversion circuit used for converting the high-voltage electrostatic field energy stored in the collection capacitor into low-voltage electrostatic field energy and transferring the low-voltage electrostatic field energy to an energy storage capacitor; the energy storage capacitor is used for storing the low-voltage electrostatic field energy, setting a target electric field energy according to the working requirement of a rear-end load, and discharging after the target electric field energy is reached; and a switch voltage stabilizing circuit used for adjusting the discharging output voltage of the energy storage capacitor, realizing constant voltage power supply for the rear-end load. The application can reduce the charging and discharging fault risk of the surface of the satellite by collecting the particles radiated to the satellite and controllably transferring and utilizing the particles.

A power converter circuit 10, comprising an input terminal for receiving energy from an external power source VS1. A switching converter 12, 14 circuit receives an input current I_IN from the input te

The application provides a protection circuit, a method, a chip, a flyback converter and a switching power supply, and relates to the technical field of switching power supplies. The input end of an auxiliary winding voltage sampling module of the desaturation protection circuit is connected with an auxiliary winding of a flyback conversion circuit, the output end of the auxiliary winding voltage sampling module is connected with the first input end of a threshold detection module, the second input end of the threshold detection module inputs a preset threshold voltage; the control end of the threshold detection module is connected with the gate of a primary power switch tube to obtain a gate drive voltage signal, a sampling control signal is generated, the threshold detection module is used for comparing the auxiliary winding sampling voltage with the preset threshold voltage, a current saturation protection signal is generated according to the sampling control signal and the comparison result, and a logic drive module generates a drive control signal according to the current saturation protection signal, so that the primary power switch tube is controlled to desaturate. The application can realize current desaturation protection of the flyback converter.

A system includes a first circuit, a converter circuit and a testing system. The first circuit is configured to generate a radio frequency (RF) signal, the RF signal having a first oscillation frequency. The converter circuit is coupled to the first circuit, configured to receive the RF signal, and to convert the RF signal into a first voltage representative of a value of the first oscillation frequency. The first voltage is a direct current voltage. The testing system is coupled to the converter circuit, and configured to receive the first voltage, and to perform a wafer acceptance test (WAT) on the first oscillation frequency in response to the first voltage.