182 results about "Conduction mode" patented technology

The utility model provides a liquid cooling assembly, a battery module and a battery pack. The liquid cooling assembly comprises a heat exchange unit and a connecting pipe set, the heat exchange unit comprises a plurality of heat exchange parts arranged at intervals in the X direction, a cylindrical battery column is installed between every two adjacent heat exchange parts, each heat exchange part is used for being connected with the cylindrical battery column in a heat conduction mode, each heat exchange part is provided with a conveying flow channel, and each conveying flow channel is provided with a liquid inlet and a liquid outlet; the connecting pipe set comprises a liquid inlet branch pipe and a liquid outlet branch pipe, the liquid inlet branch pipe sequentially communicates with the multiple liquid inlets, an inlet allowing cooling liquid to flow in is formed in the liquid inlet branch pipe, the inlet is far away from the two heat exchange parts located on the edge in the multiple heat exchange parts, and the liquid outlet branch pipe sequentially communicates with the multiple liquid outlets. And an outlet through which the cooling liquid flows out is formed in one end of the liquid outlet branch pipe, so that the pressure drop difference caused by the length difference of pipelines can be reduced, enough cooling liquid flow can be ensured to be obtained by each heat exchange part, and the uniformity of cooling liquid flow conveying is improved.

The invention discloses a zero-voltage turn-on circuit and a zero-voltage turn-on method of a switching tube in a switching power supply, and belongs to the technical field of circuits. In a critical conduction mode, when a low-side power tube is turned off, the rising edge zero-voltage starting circuit compares a switch node voltage with an input voltage or compares the switch node voltage with an output voltage under the control of a low-side gate driving voltage, outputs a high level to a high-side gate driving end when the switch node voltage is equal to the input voltage or the output voltage, and outputs a low level to a low-side gate driving end when the high level is equal to the output voltage. A high-side power tube is controlled through a high level to realize zero-voltage starting; in a critical conduction mode, when the high-side power tube is turned off, the falling-edge zero-voltage starting circuit compares an induced voltage with a pull-up resistor voltage under the control of a high-side gate driving voltage, outputs a high level to a low-side gate driving end when the induced voltage is equal to the pull-up resistor voltage, and controls the low-side power tube to realize zero-voltage starting through the high level. The induced voltage is equal to the sum of the pull-up resistor voltage and the switch node voltage. According to the invention, the transmission delay can be reduced.

A switch control method is applied to a hybrid voltage converter including a switched capacitor unit and a freewheeling unit. The method including obtaining the output current of the hybrid voltage converter, when the output current is greater than a first current threshold, controlling the switches in the hybrid voltage converter to operate in parallel conduction mode, when the output current is less than the first current threshold, controlling the switches in the hybrid voltage converter to operate in sequential conduction mode. When the switches operate in parallel conduction mode, N switches in the switched capacitor unit are controlled to turn on and off with the same duty cycle and a phase shift of 360 / N degrees. When the switches operate in sequential conduction mode, each switch in the switched capacitor unit is controlled to conduct individually with the same duty cycle in sequence.

A power factor correction (PFC) control circuit includes a pulse-width modulation (PWM) circuit configured to control a switch of a switching power converter. The PFC control circuit further includes a mode control circuit configured to select a conduction mode from a plurality of conduction modes for the switching power converter based at least in part on an output power of the switching power converter and to control a beginning of a switching cycle of the switching power converter based on the selected conduction mode. In addition, the PFC control circuit includes a current regulation circuit configured to provide a regulation signal to the PWM circuit to regulate an average coil current of the switching power converter in each of the plurality of conduction modes.

A method for charging a battery pack via an offboard energy source uses an interleaved boost converter and closed-loop control. The energy source outputs a charging current via a DC charge port during a direct current fast-charging (DCFC) process. A controller detects a voltage disparity condition in which a voltage capability of the battery pack exceeds a voltage capability of the energy source. In response to this condition, a rise of the charging current over time is recorded as a current trajectory and an open-loop equivalent time constant is extracted from the current trajectory. A time constant of the PI control block is set substantially equal to the equivalent time constant. The PIM is controlled in closed-loop using proportional-integral control. The charging current is controlled in a continuous current conduction mode during the DCFC process.

The invention relates to a resonant converter, which comprises a primary side switch circuit; the resonant cavity comprises a transformer, a primary winding and a secondary winding, and the primary winding is electrically connected to the primary switching circuit; the secondary side switching circuit is electrically connected to the secondary side winding and comprises a first switching bridge arm and a second switching bridge arm, and a phase shift angle exists between the first switching bridge arm and the second switching bridge arm; wherein secondary side current flowing through the secondary side winding selectively works in a forced continuous conduction mode, a continuous conduction mode or a critical conduction mode according to the operation of the primary side switching circuit and the secondary side switching circuit; and the control circuit is used for adjusting the switching frequency and the phase shift angle of the primary side switching circuit and the secondary side switching circuit when the secondary side current flowing through the secondary side winding works in a forced continuous conduction mode or a continuous conduction mode, so that the secondary side current flowing through the secondary side winding is gradually adjusted to work in a critical conduction mode. And the actual voltage gain value of the resonant converter is controlled at the default voltage gain value.

The utility model discloses a deicing device which is used for deicing a battery replacing vehicle, a battery pack of the battery replacing vehicle is installed at the bottom of a vehicle body through a locking mechanism so that quick replacement of the battery pack can be achieved, the deicing device comprises a movable vehicle body and an electromagnetic heating unit installed on the vehicle body, and the electromagnetic heating unit can generate an alternating electromagnetic field on the periphery of the electromagnetic heating unit; the machine body can move to the bottom of a vehicle body of the battery changing vehicle and enables the bottom of the vehicle body and / or the locking mechanism to be heated under the action of the alternating electromagnetic field of the electromagnetic heating unit so as to conduct deicing operation on the bottom of the vehicle body and / or the locking mechanism. Heat for hot melting of the ice layer comes from heat energy generated by the locking mechanism and / or the vehicle body, and the heat energy is transmitted into the ice layer in a direct contact solid conduction mode, so that the transmission loss of the heat energy from the locking mechanism and / or the vehicle body to the ice layer is greatly reduced, the ice layer receives the heat from the locking mechanism and / or the vehicle body to a large extent, and the service life of the ice layer is prolonged. And the ice melting efficiency is greatly improved.

The invention relates to an operation mode control technique for a power factor correction circuit. A power factor correction (PFC) control circuit includes a pulse width modulation (PWM) circuit configured to control a switch that switches a power converter. The PFC control circuit also includes a mode control circuit configured to select a conduction mode from a plurality of conduction modes for the switching power converter based at least in part on an output power of the switching power converter, and controlling a start of a switching cycle of the switching power converter based on the selected conduction mode. Further, the PFC control circuit includes a current regulation circuit configured to provide a regulation signal to the PWM circuit to regulate an average coil current of the switching power converter in each of the plurality of conduction modes.

The invention discloses a trapezoidal wave current soft switching method of an interleaving DC-DC converter, which is used for a two-phase interleaving bidirectional DC-DC converter based on a coupling inductor and a multi-phase interleaving converter thereof, and is characterized in that an inductive current adopts a trapezoidal wave mode, so that the converter works in an approximate critical conduction mode; a fixed switching frequency control or hybrid control method is adopted, so that the device can work in a Buck mode and can also work in a Boost mode. The method for realizing the soft switching is characterized in that the parasitic capacitance or the external resonant capacitor of the switching tube is discharged to be zero under the resonance action of the inductor and the capacitor in the dead zone time when the upper bridge arm switch and the lower bridge arm switch are alternately switched on, so that the zero-voltage switching-on of all the switching tubes is realized. And each phase current sharing control is adopted in the multi-phase interleaving parallel topological structure. According to the invention, the problems of large current peak value and high turn-off loss of a traditional triangular wave current mode are solved, the output ripple current is reduced, a soft switching method is provided, the switching loss is reduced, and the conversion efficiency of the converter is improved.

The invention provides a power battery system, a series-parallel connection control method, a movable carrier and a storage medium, and relates to the technical field of power batteries, the system comprises a control module, a switch module and N battery packs; the switch module is electrically connected with the control module and each battery pack respectively; the control module is used for responding to the charging and discharging control strategy and sending a series-parallel connection control signal to the switch module, and the series-parallel connection control signal comprises a series connection signal, a parallel connection signal or a series-parallel connection signal; and the switch module is used for entering a target conduction mode according to the control signal, so that the battery packs are connected according to a target connection mode, and the target connection mode comprises a series connection mode, a parallel connection mode or a series-parallel connection mode. The compatibility of the power battery system is improved by controlling the series-parallel connection mode of the battery packs in the power battery system.

The utility model discloses an unattended crude oil handover metering system, which is characterized in that a first density totalizer is arranged on the basis of a traditional dynamic handover system to detect the density of crude oil on line, and the first density totalizer adopts metering equipment for measuring the density of the crude oil on line by using electrical characteristics; crude oil density can be mutually verified through a capacitance mode and an electric conduction mode, the accuracy of crude oil density detection is improved, compared with other density metering equipment, the measured density error is small, and a parameter verification assembly is arranged on the basis of a traditional dynamic handover system. A second flow meter, a second temperature transmitter, a second pressure transmitter, a second water content meter and a second density integrating instrument are arranged on the verification pipeline, the front end of the verification pipeline is connected with a calibration crude oil tank through an oil supply pipe, calibrated crude oil is adopted, it can be avoided that metering devices of the same kind go wrong at the same time, and the accuracy of the verification process is guaranteed.

The invention provides a vehicle with a welded bus bar connector. In a high voltage vehicle electronic system, an electronic component having a tab is welded to a bus bar using pulsed laser welding. Each tab is welded to the bus bar by an array of welds. Each spot welding portion includes an inner region formed in a pinhole mode by laser welding and an outer region formed in a conduction mode by laser welding. The density of energy applied to the inner region is between ten and twenty times higher than the density of energy applied to the outer region.

This application discloses a power conversion device, a converter control method, and a system, belonging to the field of converter control technology. It includes: a condition identification module that monitors the voltage characteristics at the switching nodes of the converter and outputs an intermittent conduction mode enable signal; a frequency dithering modulation module that generates an instantaneous switching frequency based on a preset center frequency; a voltage closed-loop control module that determines a reference duty cycle based on the deviation between the converter's output voltage and a target reference voltage; and a feedforward compensation module that corrects the reference duty cycle based on the preset center frequency, the instantaneous switching frequency, and the intermittent conduction mode enable signal to obtain a corrected duty cycle. This application, through digital control and simple hardware, effectively eliminates low-frequency output voltage ripple caused by frequency dithering in intermittent conduction mode while retaining the significant electromagnetic interference reduction advantage of frequency dithering technology. It features low hardware cost, high system stability, and fast dynamic response.

The embodiment of the invention provides a method for controlling a DC / DC converter of a battery system, and the method comprises the steps: controlling the operation parameters of the DC / DC converter of the battery system based on the collected stack current IS of a battery stack of the battery system, so as to adjust the phase current of the DC / DC converter, and enabling a first DC / DC conversion unit and a second DC / DC conversion unit to be connected in parallel, according to the method, at least three operation intervals of the DC / DC converter are divided based on the collected stack current of the battery stack, so that in each operation interval, a first DC / DC conversion unit and / or a second DC / DC conversion unit only operate in one conduction mode, and the conduction modes comprise a continuous conduction mode and / or a discontinuous conduction mode (S1); the first phase current of the first DC / DC conversion unit or the second phase current of the second DC / DC conversion unit is selected as the AC injection current of the battery system on the basis of the conduction mode of the DC / DC conversion units (S2).

The invention relates to the technical field of power electronic component manufacturing and advanced composite material application, in particular to a 3D inductor based on the Ampere's law and a method thereof. The three-dimensional precise interlocking winding comprises a functional composite framework, a three-dimensional precise interlocking winding and a magnetic core assembly, according to the system, a framework is formed by compositing a heat-conducting insulating substrate and soft magnetic powder, and air gaps between winding layers are physically filled through step-shaped positioning ribs; the core is that a low-thermal-resistance export path is established by utilizing the high heat conduction characteristic of the framework, and a heat conduction mode is converted from coil-to-air to coil-to-framework; the gradient difference between the core temperature and the surface temperature in the coil is effectively reduced through the embedded heat dissipation array, the heat dissipation problem under the high power density is solved, and the device performance is remarkably improved.

The present application belongs to the technical field of power semiconductor, and relates to an enhanced GaN longitudinal field effect transistor with reverse freewheeling capability. The main feature of the present application is that when etching a P-GaN layer, the P-GaN layer under a gate is reserved, so that the enhanced GaN longitudinal field effect transistor is realized, and meanwhile, part of the unetched P-GaN layer at the other end of the device is reserved to form contact with a source metal, so as to integrate a freewheeling diode with an anode and a source short-circuit and a cathode and a drain short-circuit. The freewheeling diode is only turned on in a reverse conduction mode, and is turned off in a forward conduction mode and a blocking mode, and does not affect the forward characteristics of the device. Compared with a freewheeling diode connected in reverse parallel outside the device, the present application reduces parasitic parameters, improves power density, and is simple in process and easy to implement.

The application relates to a critical conduction mode control method of a totem-pole PFC converter, which utilizes energy equivalence to determine the resonance process of inductor current at switching commutation, carries out totem-pole Boost inductor current value estimation, and on this basis, utilizes a current zero-crossing point prediction algorithm to calculate the turn-on and turn-off time to generate corresponding active tube-synchronous rectifier tube commutation dead time T d,f , synchronous rectification conduction time T SR , rectifier tube-active tube commutation dead time T d,r ; the PWM drive signals of high-speed switching tubes Q1 and Q2 are generated by T on , T d,f , T SR , T d,r ; the power frequency drive signals of low-speed switching tubes Q3 and Q4 are generated by comparing the input alternating voltage v ac with a hysteresis comparison loop and 0. The method can effectively get rid of the dependence on a current zero-crossing detection circuit and a current sensor, reduces the cost and improves the system stability.

A control apparatus includes a first signal generator configured to generate a first reset signal for determining an on-time of a high-voltage side switch of a first phase of a multi-phase power converter; a first comparator configured to generate a first set signal for determining a conduction moment of the high-voltage side switch of the first phase based on comparing the first current sensing signal and the voltage control signal; a first zero-crossing detection circuit configured to detect a zero-crossing point of the inductive current of the first phase; and a first phase bias voltage generator configured to generate a first bias voltage for configuring the first phase to exit the first continuous conduction mode when a zero crossing point of the inductive current of the first phase is detected.

This invention provides a bidirectional transient voltage suppressor with low dynamic resistance and high surge capability, comprising: a heavily doped semiconductor substrate of a first conductivity type; a first epitaxial layer disposed on the substrate; a conduction modulation buried layer disposed on the first epitaxial layer; a second epitaxial layer disposed on the conduction modulation buried layer; a heavily doped first conductivity type region disposed on the second epitaxial layer; a first electrode disposed on the front side of the heavily doped first conductivity type region and a second electrode disposed on the back side of the substrate; the conduction modulation buried layer is disposed inside the double epitaxial body region and is configured to form a high-concentration conductivity modulation region of charge carriers under transient high current impact conditions, forming a body region-dominated conduction path between the first epitaxial layer and the second epitaxial layer, so that the conduction current changes from concentrated conduction in the PN junction region to a laterally extended and planar distributed overall conduction mode within the body region, thereby reducing the dynamic resistance of the device and improving the surge carrying capacity of the device.

The invention discloses an ultra-low frequency conduction acoustic system based on reverse installation and a sapphire reflection structure, and belongs to the field of audio acoustics, the ultra-low frequency conduction acoustic system comprises a moving coil unit, the sapphire reflection structure and a sound tube, the moving coil unit is reversely installed on the inner side of an earphone surface cover, and a vibrating diaphragm faces the direction away from a sound outlet; sound waves are reflected to the reflecting surface of the stone surface cover of the sapphire reflecting structure through the rear cavity and then are transmitted to the sound outlet through the sound tube; the surface cover of the sapphire reflection structure is of a customized special-shaped structure, is accurately matched with the reflection angle of the rear cavity, and has optical-grade surface smoothness; the moving coil unit is combined with a plurality of moving iron units and static units, and the moving iron units and the static units adopt a forward sound wave conduction mode; the reverse sound wave path is prolonged and reflected by the high-hardness sapphire, and the low-frequency quantity sense is sufficient and distinct in hierarchy; an independent low-frequency sound path can be realized without increasing the volume of the earphone; low frequency and medium-high frequency are physically isolated, and mutual interference is reduced.

The invention relates to a modular charging connector, which comprises an integrated main body, a socket body, an alternating current and direct current terminal parallel connection module, a heat conduction temperature measurement module and a grounding and low-voltage signal module, the integration main body is combined with the socket body, the alternating current and direct current terminal parallel module and the heat conduction temperature measurement module are simultaneously accommodated in the integration main body, the heat conduction temperature measurement module is in thermal contact with a direct current / alternating current terminal of the alternating current and direct current terminal parallel module, the working temperature during charging is detected in a heat conduction mode, and the grounding and low-voltage signal module forms a connector form. The integrated main body is combined with the socket body and forms interlocking with the integrated main body; according to the connector, the components are modularized, and the modules are integrated and concentrated by taking the integrated main body as a core, so that the purposes of being easy to assemble and produce and beneficial to realizing automatic layout are achieved; in addition, the heat conduction temperature measurement module fully utilizes the space, the same group of sensing elements simultaneously sense the working temperature of the direct current / alternating current charging terminal in a heat conduction mode, and the charging temperature is more accurately detected.

The invention discloses an AC voltage conversion circuit and a control method, and relates to the technical field of power electronics, and the AC voltage conversion circuit comprises a control module, an input inductor, a switching tube module, a first follow current capacitor, a second follow current capacitor and an output capacitor. The first end of the input inductor is connected with the first end of the input power supply, and the second end is connected with the first end of the switching tube module; the second end of the switching tube module is connected with the second end of the input power supply, the third end is connected with the first end of the second follow current capacitor, the first end of the output capacitor and the first end of the load, and the fourth end is connected with the second end of the second follow current capacitor and the first end of the first follow current capacitor; and the fifth end is connected with the second end of the first follow current capacitor, the second end of the output capacitor and the second end of the load. By arranging the inductor, the capacitor, the switch tube and other devices, the devices are more concise, and the control module can realize conversion between direct current and alternating current only by controlling the conduction mode of the switch tube module.

The embodiment of the invention provides electronic equipment, and belongs to the technical field of electronics, a shell of the electronic equipment comprises a structural part opposite to a display screen, and a heating device, an active liquid cooling module and a passive liquid cooling module are arranged in a containing cavity of the shell. The display screen or the structural member, the active liquid cooling module, the passive liquid cooling module and the heating device are stacked and are in mutual heat conduction contact, heat of the heating device is transmitted to the display screen or the structural member with a large area through the passive liquid cooling module and the active liquid cooling module for heat dissipation, the heat dissipation area is increased, and the heat dissipation efficiency is improved. By means of the heat conduction mode that the passive liquid cooling module is combined with the active liquid cooling module, efficient heat transfer can be achieved, the heat can be dispersed to all areas of the display screen or the structural part along with circulation of a refrigerant in the active liquid cooling module, the heat dissipation effect is remarkably improved, and the high heat dissipation requirement is met. According to the stacked structural design, the thinning design requirement of the electronic equipment can be met under the condition that the heat dissipation performance of the electronic equipment is improved.

The invention discloses a battery device and electric equipment. The battery device comprises a box body which is provided with an accommodating space and comprises a limiting beam; the battery monomer assembly is arranged in the accommodating space, and limiting beams are respectively arranged on two sides of the battery monomer assembly along the first direction; the heat management part is arranged in the containing space and comprises a plurality of heat exchange parts, the heat exchange parts are arranged in the second direction, battery monomers are connected between every two adjacent heat exchange parts in a heat conduction mode, each heat exchange part comprises a current collector and a body part, and the current collector is arranged on one side of the body part and connected with the body part in the height direction of the box body; the current collector and the body part extend in the first direction, a heat exchange flow channel is formed in the body part, the current collector is configured to guide a heat exchange medium into the heat exchange flow channel and is configured to guide the heat exchange medium out of the heat exchange flow channel, and the body part is connected with the limiting beams located on the two sides of the battery monomer assembly in the first direction respectively.

This application relates to modulator circuits (401, 501) for driving switching output stages (102) in a class-D amplifier system (400) or the like. The switching output stage (102) has an output node (105) and high-side and low-side switches (104H, 104L) for selectively connecting the output node to respective high-side and low-side voltages (VH, VL) and is configured to be operable in a continuous conduction mode of operation, in which there is always an output current flowing throughout a switching cycle and also in a discontinuous conduction mode of operation where there is a period in each switching cycle where there is no output current. The modulator circuit comprises a compensator (407, 408) operable to apply compensation, in the discontinuous conduction mode of operation, to at least partly compensate for a non-linearity when operating in the discontinuous conduction mode.

A power converter includes a transformer having a pair of secondary windings coupled together via a common node, a hold-up circuit that includes a first controllable switch coupled with the common node. The first controllable switch is controlled into a non-conduction mode during a first portion of a hold-up time condition to prevent current flowing through a first secondary winding of the pair of secondary windings from flowing from the common node through the hold-up circuit. The first controllable switch is also controlled into a conduction mode during a second portion of the hold-up time condition to enable current flowing through the first secondary winding to flow from the common node through the hold-up circuit. No portion of the current flowing through the first secondary winding flows through a second secondary winding of the pair of secondary windings during the control of the first controllable switch into the conduction mode.

The embodiment of the invention provides a vehicle-mounted power supply device, a power assembly and an electric vehicle, relates to the technical field of vehicles, and is used for solving the problem that the space utilization rate of the vehicle-mounted power supply device is low. A circuit board and a radiator in an electrical assembly of the vehicle-mounted power supply device are adjacently arranged in a shell in the first direction, and one or more first magnetic devices are arranged on the other side, away from the circuit board, of the radiator. One side, facing one radiator, of one circuit board is used for fixing two rows of power devices which are arranged at intervals along a third direction, and at least three power devices in each row of power devices are arranged at intervals along a second direction. One side, facing one circuit board, of one radiator is used for being connected with two rows of power devices in a heat conduction mode, the other side, deviating from the circuit board, of one radiator is used for being connected with one or more first magnetic devices in a heat conduction mode, and the power devices and the first magnetic devices are arranged more compactly while the radiators cool the power devices and the first magnetic devices. And the space utilization rate of the vehicle-mounted power supply device is improved.

The invention discloses a low noise amplifier for embedded semiconductor refrigeration. The low noise amplifier comprises a shell, a circuit board, a semiconductor refrigerator and a heat sink, the shell comprises a base and a cover body; the circuit board is arranged on the base, and the circuit board bears an amplifying circuit comprising a first-stage amplifying transistor; the base is provided with an accommodating groove; the semiconductor cooler is contained in the containing groove, and the hot face of the semiconductor cooler is in heat conduction connection with the base. The heat sink is in heat-conducting connection with the cold surface of the semiconductor cooler; the heat sink is provided with a heat conduction part, and the heat conduction part penetrates through an opening in the circuit board and is connected with the first-stage amplification transistor in a heat conduction mode so as to achieve directional refrigeration of the transistor. According to the invention, only the first-stage transistor of the low-noise amplifier is refrigerated, the required cooling capacity is small, the low-noise amplifier can be realized by adopting the semiconductor refrigerator, and the low-noise amplifier has the characteristics of simple structure, small volume, low refrigeration cost and no maintenance. By using the structure and the refrigeration method provided by the invention, the temperature of the first-stage transistor can be reduced to-40 DEG C from room temperature.

The invention discloses a direct current boost-buck circuit, a control method of the direct current boost-buck circuit and an energy storage power supply. The DC buck-boost circuit comprises a first inductor, a second inductor and a switch module. The inductance value of the first inductor is larger than that of the second inductor. And the switch module is configured to control the conduction modes of the first inductor and the second inductor so as to realize the following three conduction modes. One of the first inductor and the second inductor is connected to the direct-current buck-boost circuit, or the first inductor and the second inductor are connected in parallel and then connected to the direct-current buck-boost circuit, or the first inductor and the second inductor are connected in series and then connected to the direct-current buck-boost circuit. The switch module realizes different conduction modes by controlling the first inductor and the second inductor, and the direct-current buck-boost circuit has different inductance values in the different conduction modes, so that the inductance of the direct-current buck-boost circuit is always suitable for the current load, and the energy conversion and transmission efficiency is improved.

Embodiments relate to a voltage regulator. The voltage regulator can include plural phase blocks. The plural phase blocks can include a single-stage multi-phase series capacitor buck converter configured to operate at a boundary between continuous conduction mode and discontinuous conduction mode.