206 results about "Low voltage circuits" patented technology

The invention relates to the technical field of welding, and provides a low-load voltage circuit and a lithium battery welding machine. The circuit comprises a main control module, a voltage detection unit, a switching circuit, a pulse modulation unit and a current sampling feedback unit. The voltage detection unit monitors the end voltage of a welding gun of a welding machine in real time, the switching circuit limits the output voltage to be smaller than a safety threshold value of 36 V in a no-load mode, and a built-in bidirectional thyristor achieves isolation of a high-voltage loop and a low-voltage loop. The pulse modulation unit adjusts the on-off frequency of a main power loop, and the current sampling feedback unit dynamically adjusts the pulse duty ratio so as to accurately control the welding current. The lithium battery welding machine integrates the circuit and is provided with a welding gun assembly, a main transformer and a power supply module, the electric shock risk is effectively reduced, and the welding quality and efficiency are improved.

The present invention provides a low-voltage circuit breaker, which belongs to the technical field of circuit breakers. The invention includes a circuit breaker body, wiring terminals and guide rails, and also includes: a limit clamping assembly, a blocking assembly, and a clamping assembly; by pulling a pull rod and pressing a dial rod, the wiring terminals and the movable clamp can be quickly unlocked to achieve rapid replacement of the circuit breaker, and during the wiring process, the internal circuit of the circuit breaker is in a disconnected state; the protective frame formed by the sliding block and the fixed baffle, and the expansion and contraction of the airbag, together fix and seal the wiring terminals, reduce the influence of external factors such as water vapor and dust on the wiring port, and prevent staff from accidentally touching it, further enhancing the safety of operation; the clamping assembly can better match wiring terminals of different specifications through the expansion and contraction of the airbag and the compression and release of the spring, ensure the stability of the wiring terminals, and effectively reduce the risk of poor electrical connection or damage caused by shaking of the wiring terminals.

The invention provides a band-gap reference circuit for a low-voltage circuit, which comprises a clamping operational amplifier circuit for receiving an input voltage and outputting an amplified input voltage under the control of a bias voltage; the feedback adjustment circuit performs feedback adjustment on the amplified input voltage to obtain a feedback voltage; the current mirror circuit generates reference voltage and reference current according to the feedback voltage; the transistor circuit generates a positive / negative temperature coefficient current by using a reference voltage and generates an input voltage. The reference voltage output circuit generates and outputs a bandgap reference voltage using the reference current. The threshold voltage of a transistor in the circuit is reduced by using a substrate bias technology, the input node of the clamping operation amplification circuit is optimized, the minimum power supply voltage for working of the circuit is reduced, the loop is improved by using the feedback adjustment circuit, the power supply suppression capability is improved, and the stability of the output band-gap reference voltage is improved; the problems of how to improve the minimum power supply voltage of the band-gap reference circuit and how to optimize the power supply suppression effect are solved.

A method of operating an EV in one of various states provides an inverter control system having a high voltage circuit powered by a high DC voltage power source; a low voltage circuit powered by a low DC voltage power source that is substantially less than the voltage of the high voltage power source, the low voltage circuit being configured to power a microcontroller; and an inverter circuit having a plurality of high side switches and a plurality of low side switches, the inverter circuit being configured to deliver AC power to a traction motor. Upon powerup of the high voltage circuit and with the low voltage circuit being unpowered, the method establishes an emergency tow state with each of the high side switches and each of the low side switches being open permitting the EV to be towed without damaging the motor.

A circuit breaker protects an electrical low-voltage circuit. The circuit breaker has a housing with first and second connections on the mains side and first and second connections on the load side, and an isolating contact unit connected to an electronic interrupting unit. The isolating contact unit can be switched by opening contacts to prevent current flow or by closing contacts for current flow in the low-voltage circuit. The electronic interrupting unit is switched by semiconductor-based switching elements into a high-impedance state for preventing the current flow or into a low-impedance state of the switching elements for the current flow in the low-voltage circuit. A current sensor determines the level of the current of the low-voltage circuit. A controller is connected to the current sensor, the isolating contact unit and the electronic interrupt unit, such that a first measuring impedance is provided between the first and the second load-side connection.

A circuit breaker device for a low-voltage circuit has a mechanical isolating contact unit connected in series with an electronic disconnection unit. The mechanical isolating contact unit is switched by opening contacts to prevent current flow or closing the contacts for current flow in the low-voltage circuit. The electronic disconnection circuit is switched by semiconductor-based switching elements into a high-resistance state of the switching elements or into a low-resistance state of the switching elements for current flow in the low-voltage circuit. When the amount of an instantaneous current value of the low-voltage circuit exceeds at least one current threshold value, prevention of the current flow of the low-voltage circuit is initiated. The at least one current threshold value is adjusted according to the magnitude of the voltage of the circuit breaker device.

An integrated series-connected lamp string comprises light sources and control boxes, and each light source is provided with a control box; the control box comprises a power inlet connector, a power transmission connector and an accommodating space, wherein a circuit board is arranged in the accommodating space, and the circuit board is provided with a transformer module and a control module; the power inlet connector is provided with a first high-voltage connection end, the power transmission connector is provided with a low-voltage connection end and a second high-voltage connection end, and the commercial power forms a high-voltage circuit and a low-voltage circuit through the transformer module; the high-voltage circuit is connected to the first high-voltage connection end of the next stage through the second high-voltage connection end, and the low-voltage circuit is connected to the light source through the low-voltage connection end.

The invention discloses a method for predicting the service life of an arc extinguishing device of a low-voltage circuit breaker. An arc extinguishing chamber is divided into a left arc starting area, a middle motion area and a right arc extinguishing area along an arc motion path; configuring a special multi-mode sensor group for each section, and respectively acquiring physical signals related to the core degradation mechanism of each section; extracting characteristic parameters including an arcing phase angle, an arc movement speed and an air pressure rising rate from the signal, and calculating an efficiency coefficient of each section; based on the efficiency coefficient and the accumulated stress, establishing an independent exponential attenuation model for each section to calculate the accumulated degradation amount; and finally, the maximum accumulated degradation amount in the three sections is taken as a system health state index, and accurate prediction of the residual life is realized. According to the method, the problems that a prediction object is fuzzy and a fault cannot be positioned in a traditional method are solved, the crossing from overall early warning to accurate section diagnosis is realized, and an effective means is provided for predictive maintenance of the low-voltage circuit breaker.

A circuit breaker protecting an electric low-voltage circuit includes a housing with grid-side and load-side connections and a series circuit of a mechanical isolating contact unit on the grid side and an electronic interruption unit on the load side. The mechanical isolating contact unit has a handle opening and closing contacts. A current sensor unit is disposed in a conductor between the isolating contact unit and the interruption unit, for ascertaining a current level of the low-voltage circuit. A control unit is connected to the current sensor unit, electronic interruption unit, and mechanical isolating contact unit. When current and / or current / time thresholds are exceeded, prevention of a current flow in the low-voltage circuit is initiated. A power supply unit supplying energy to the circuit breaker is connected to conductors of the low-voltage circuit between the isolating contact unit and the interruption unit.

The application discloses an arc fault detection device for a low-voltage circuit breaker and relates to the technical field of low-voltage circuit breaker fault detection.The device comprises a workbench, wherein an elevated platform is installed on a reference plate of the workbench;an infrared temperature measurement probe is installed on a first supporting rod of a first support;an industrial frequency magnetic field measuring device is installed on a second supporting rod of a second support;first and second inclined surfaces are symmetrically arranged on the left and right sides of a third support;third and fourth supporting rods are respectively installed on the first and second inclined surfaces;first and second noise detection probes are respectively installed on the inner ends of the third and fourth supporting rods;and a fifth supporting rod is arranged between the third and fourth supporting rods, and a third noise detection probe is installed on the bottom end of the fifth supporting rod.The device eliminates the blind area of traditional single-point detection, can capture complete high-frequency noise spectrum radiated by various types of fault arcs in the circuit breaker without dead angles, ensures complete extraction of characteristic signals, and avoids misjudgment caused by signal attenuation or directionality omission.

The invention discloses a power module and a solid-state transformer, belongs to the field of solid-state transformers, and considers that the power module can be divided into a medium-voltage circuit and a low-voltage circuit, and electric energy required by the low-voltage circuit and the medium-voltage circuit can be uniformly obtained based on low voltage provided externally. Therefore, the low-voltage auxiliary source can supply power to the low-voltage circuit based on the electric energy provided by the system auxiliary power supply, and the medium-voltage auxiliary source obtains the electric energy from the low-voltage auxiliary source in an electrical isolation mode and supplies power to the auxiliary circuit in the medium-voltage circuit, so that the system auxiliary power supply can supply the electric energy to the low-voltage auxiliary source through the low-voltage cable. The level requirement of protection design is reduced, and the cost is reduced; and the medium-voltage auxiliary source and the low-voltage auxiliary source are electrically isolated, so that the system control module can directly send a system control instruction to the low-voltage circuit through a low-cost cable, and the cost is further reduced.

The invention discloses a range-extended rear wheel side motor motorcycle which is mainly composed of a range extender, a generator, a vehicle control unit (VCU), a wheel side motor and a battery. According to the vehicle, the range extender, the battery, the motor and the low-voltage circuit are managed in a unified mode through the single VCU, and the intelligent starting and stopping function of the range extender can be automatically started and stopped according to the preset SOC value. Meanwhile, the multi-mode switching function of independent switching of three modes of pure electricity, hybrid power and charging can be achieved. In addition, the electric quantity of the storage battery can be monitored, emergency charging of the battery to the storage battery is supported, and low-voltage power supply management of long-term parking and power shortage is avoided.

The invention relates to the technical field of circuit breakers, and discloses a high-low voltage circuit breaker propelling mechanism which comprises a switching-off mechanism, a frame assembly is fixedly installed on the inner wall of the switching-off mechanism, a communication assembly is installed on the inner wall of the switching-off mechanism, and an operator pulls a spring reset rod to drive a radian stop block to move. Then a connecting rod is pushed to ascend to drive a balancing weight, a sliding rod, a spring ring and a connecting block to synchronously ascend, the connecting block ascends to push a moving contact on a moving contact supporting piece to be in contact with a static contact to enable current to be connected, when the current is large, a spring ejector rod downwards pushes an L-shaped plate to descend to enable a radian stop block to be separated from a fixing ring again, and at the moment, the connecting rod is pushed to ascend to drive the balancing weight, the sliding rod, the spring ring and the connecting block to synchronously ascend. The spring ring and the balancing weight return, and a larger initial driving force is provided by utilizing the elastic potential energy of the spring of the spring ring and the gravitational acceleration of the balancing weight, so that the moving contact supporting piece and the static contact can be quickly separated for a larger distance, the duration time of an electric arc is shortened, and the continuous combustion of the electric arc is effectively prevented.

The utility model belongs to the field of interactive circuits, particularly relates to a WIFI POT circuit, and aims to solve the problems that the existing system communication mode based on the WIFI POT circuit is complicated, and a high-voltage end circuit is easy to interfere with the communication stability. In order to solve the problems that a system based on a WIFIPOT circuit is large in standby power consumption and not beneficial to popularization and use, the utility model provides the following scheme that the system comprises an MCU control circuit, the MCU control circuit comprises an interactive interface communication module, a power reading circuit and a power control circuit, the power reading circuit comprises an IM1281B alternating current power acquisition module and an RS485 bus, and the power control circuit comprises an RS485 bus. The IM1281B alternating current power acquisition module and the RS485 bus are in communication transmission connection through TTL, the communication mode is simple and efficient, a low-voltage circuit and a high-voltage circuit prevent interference from a high-voltage end through optoelectronic isolation, in addition, a high-power magnetic latching relay serves as an action element, electric energy is consumed only at the moment of action, and the power consumption is low. And the standby power consumption and heating of the system are greatly reduced.

The motor controller comprises an outer box, and a control panel, a power module connected with the control panel, a capacitor connected with the power module, a filter connected with the capacitor, a resistor connected with the capacitor, an alternating current busbar connected with the power module and a power panel for supplying power to a low-voltage circuit in the motor controller are arranged in the outer box. The filter, the capacitor and the power module are sequentially installed on a bottom plate of the outer box, a heat dissipation water path is formed in the bottom plate of the outer box, water nozzles which are in butt joint with the water inlet end and the water outlet end of the heat dissipation water path respectively are installed, and the control panel and the power panel are sequentially arranged above the power module from bottom to top. A control shielding plate and a power shielding plate arranged above the control shielding plate are fixedly connected in the outer box, the control panel is arranged on the control shielding plate, and the power panel is arranged on the power shielding plate. According to the utility model, the heat of the motor controller can be rapidly taken away, the environmental adaptability of the motor controller is improved, and the influence of coupling electromagnetic interference on the normal operation of the motor controller is effectively reduced.

A circuit breaker for protecting an electric low-voltage circuit includes a housing with grid and load-side terminals, and a mechanical break contact unit series-connected to an electronic interruption unit. The break contact unit pairs with the load-side terminal, and the interruption unit pairs with the grid-side terminal. The current level in the low-voltage circuit, between the grid and load-side phase conductor terminals, is ascertained. Preventing current flow in the low-voltage circuit is initiated upon exceeding current and / or current / time thresholds. A measurement impedance between wires of the low-voltage circuit is connected to the connection between the break contact unit and the interruption unit. While contacts of the break contact unit are open and the interruption unit switches to high-ohmic state, the interruption unit switches to low-ohmic state for a period to check functionality of the circuit breaker.

The utility model provides a battery cluster and an energy storage system. The battery cluster comprises a plurality of battery monomers, a battery bracket and a junction box, a plurality of accommodating spaces arranged side by side are formed in the battery bracket, the plurality of accommodating spaces comprise at least one functional cavity and a plurality of battery cavities, and the functional cavity is positioned at the end part of the battery bracket; the junction box comprises a box body, a high-voltage circuit assembly and a low-voltage circuit assembly, a high-voltage area and a low-voltage area are formed in the box body, the high-voltage circuit assembly is arranged in the box body, located in the high-voltage area and used for being electrically connected with the battery monomers and the converter, and the low-voltage circuit assembly is arranged in the box body, located in the low-voltage area and used for being electrically connected with the converter. The connector is used for electrically connecting a high-voltage circuit assembly and a battery management system. Wherein the plurality of single batteries are respectively and correspondingly arranged in the plurality of battery cavities, and the junction box is arranged in the functional cavity.

The invention belongs to the technical field of integrated circuits, and particularly relates to an ESD electrostatic protection structure suitable for a low-voltage circuit. The ESD electrostatic protection structure adopts a mode that an NPN triode with a floating layered base region structure is used for assisting in triggering an SCR to discharge forward ESD current and a PN junction diode to discharge negative ESD current; the NPN triode with the floating layered base region structure comprises an N + active region I, a P-type ESD injection region, a P well I and an N + active region II, the first N + active region and the second N + active region are a collector region and an emitter region of the NPN triode respectively, the base region is composed of a P-type ESD injection region and a first P well, the P-type ESD injection region is located below the first N + active region, and the base region is of a floating layered structure. The ESD protection structure is provided with a bidirectional rapid ESD current discharge path to the ground, so that the SCR trigger voltage is reduced.

A low voltage (LV) circuit for mitigating voltage fluctuations caused by energy regeneration of electric vehicles, the LV circuit comprising a control unit configured to receive at least one indication of a regenerative energy from an electric power assisted steering (EPAS) motor and send at least one control signal to control at least one switch such that the regenerative energy is absorbed by a load when at least one indication is larger than a threshold.

The invention belongs to the technical field of circuit breakers, and relates to an arc extinguishing chamber of a low-voltage circuit breaker, which comprises a shell, an air inlet arranged at the bottom of the shell, an air outlet arranged at the top of the shell, and a plurality of arc extinguishing grid plates arranged between the air inlet and the air outlet in parallel, a first arc isolating cover and a second arc isolating cover are oppositely arranged on the inner walls of the two sides of the air inlet and are provided with inclined side walls from bottom to top and from inside to outside, so that the air inlet forms a Venturi pipeline structure with a wide lower part and a narrow upper part; the Venturi pipeline structure is used as a moving contact opening and closing receding groove. Compared with the prior art, a group of isolation hoods are oppositely arranged at the air inlet of the arc extinguish chamber, and the side walls of the isolation hoods are designed to be the inclined side walls which obliquely extend inwards, so that a Venturi pipeline which is narrow at the upper part and wide at the lower part is formed at the air inlet of the arc extinguish chamber, air flow is enabled to quickly circulate, and electric arcs are driven to quickly enter the arc extinguish chamber.

A circuit breaker for protecting a low-voltage electric circuit for an AC voltage, ascertains the level of an instantaneous differential current of conductors of the low-voltage circuit. If an instantaneous differential current quantity has been overshot, a prevention of current flux in the low-voltage circuit is initiated by a high-ohmic state of switching elements of an electronic interruption unit in the closed state of break contacts. A method for using a circuit-breaker for protecting a low-voltage electric circuit for an AC voltage, is also provided.

The utility model discloses a novel low-voltage circuit breaker, which comprises a circuit breaker main body and an on-off key, the circuit breaker main body is fixedly connected with a support frame, the support frame is located right above the on-off key, and the inner side of the support frame is detachably connected with a signboard, so that a user can conveniently distinguish the circuit breaker. According to the circuit breaker, the signboard is arranged on the circuit breaker main body, so that a user can quickly find the corresponding circuit breaker according to the information of the signboard, the user can conveniently distinguish the circuit breaker, the risk of turning off the circuit breaker by mistake can be reduced, and the use convenience can be improved.

The utility model relates to the technical field of low-voltage circuit breakers, and discloses a quality detection device for a low-voltage circuit breaker, which comprises a checker body, a connecting line, a gauge outfit, a lantern ring, a first rotating shaft, a second limiting block, a second limiting frame and an adjusting assembly, the top of the checker body is fixedly connected with the connecting line, the front end of the connecting line is fixedly connected with the gauge outfit, and the gauge outfit is fixedly connected with the lantern ring. An adjusting assembly is arranged at the front end of the inspector body, and a lantern ring is arranged at the front end of the inspector body. Compared with the mode that a limiting block abuts against the rear end of a lantern ring, a second optical shaft is pulled outwards to enable a second limiting frame to be away from a second limiting block, then the lantern ring is rotated through a first rotating shaft, the rotating angle is increased, the second limiting frame is reset through elasticity of a second spring, and the second optical shaft is fixed through a square block; rotation is prevented, stability is improved, vertical angle adjustment of the gauge outfit can be carried out, multi-position detection of the low-voltage short-circuiter is improved, and detection precision is improved.

A power supply adapter is configured for installation within an electrical junction box to enable both high-voltage and low-voltage circuitry to coexist while maintaining compliance with NEC Code requirements. The adapter includes a high-to-low voltage converter and a separator plate that divides the junction box into electrically isolated high-voltage and low-voltage subcompartments. The converter is housed entirely within the low-voltage subcompartment, and the separator plate is formed from a fire-resistant, electrically insulative material. The power supply adapter reduces installation costs and material usage by allowing low-voltage devices, such as smoke detectors, to be powered from existing high-voltage infrastructure without requiring additional junction boxes. The power supply adapter may be used as part of a smoke detector kit comprising low-voltage detectors, interconnecting signal wires, and NEC-compliant installation instructions.

The invention relates to a method for precharging a high-voltage intermediate circuit (103) of a battery system of an electrically powered vehicle, comprising a high-voltage circuit (101) with a high-voltage battery (1), a low-voltage circuit (102) with a low-voltage battery (2), a high-voltage intermediate circuit (103) for coupling the high-voltage circuit (101) with the low-voltage circuit (102), and a DC / DC converter (3) configured to convert a voltage (U2) of the low-voltage battery (2) into a voltage (U1) of the high-voltage battery (1), wherein a first high-voltage main contactor (5) is arranged in a first switching path (4) between a positive terminal of the high-voltage battery (1) and the DC / DC converter (3), and wherein a second high-voltage main contactor (6) is arranged in a second switching path (7) between a negative terminal of the high-voltage battery (1) and the DC / DC converter (3). - the high-voltage intermediate circuit (103) in an open switching position of the high-voltage main contactors (5, 6) is pre-charged to the voltage (U1) of the high-voltage battery (1) by means of the DC / DC converter (3), - then an open pre-charge contactor (14), which together with a pre-charge resistor (15) connected in series with it is connected in parallel to one of the high-voltage main contactors (5, 6), is closed, and - the two high-voltage main contactors (5, 6) are subsequently closed.

A circuit breaker device protects a low-voltage circuit and has a mechanical isolator contact unit connected to an electronic disconnection unit in series. The serial circuit is connected to a grid-side and to a load-side connection. The mechanical isolator contact unit is switched by opening contacts to prevent a current flow in the low-voltage circuit or by closing the contacts to enable a current flow. The electronic disconnection unit is switched, by semiconductor-based switch elements, to a high-ohmic state in order to prevent a current flow in the low-voltage circuit, or to a low-ohmic state of the switch elements to enable a current flow. A level of the current in the low-voltage circuit is ascertained and a process for preventing a current flow is initiated if current thresholds and / or current / time thresholds are exceeded. A high-ohmic or low-ohmic state of the electronic disconnection unit is signaled via a signaling output.

The invention discloses a new energy automobile universal vehicle-mounted charger device, and relates to the technical field of new energy automobile vehicle-mounted chargers, the new energy automobile universal vehicle-mounted charger device comprises a shell, the top edge of one end of the shell is rotatably connected with a rotating plate, and the top of the rotating plate is rotatably connected with a device box; a conversion circuit board and a low-voltage circuit board are arranged in the equipment box, and a main connecting end is arranged at one end of the equipment box. According to the universal vehicle-mounted charger equipment for the new energy automobile, a sliding handle is used for pulling a sliding plate and a main shaft out of a shell, a fourth folding plate and a third folding plate are located on the same straight line, a first folding plate and a second folding plate are located on the same straight line, and at the moment, two movable wheels make contact with the ground; the movable handle and the sliding handle are pulled to pull out the shell and the equipment box from the interior of the automobile trunk and move to the position near an automobile charging port, and the main charging gun is inserted into the automobile charging port, so that the effects of conveniently taking out the equipment from the automobile trunk and rapidly transferring the equipment are achieved.

A power supply circuit including an input circuit configured to modulate an input voltage into a first working voltage and a second working voltage, and output them; a low voltage circuit connected to the input circuit, to generate a first output voltage and output it; a high voltage circuit connected to the input circuit, to generate a second output voltage and output it; an isolation circuit configured to output the first output voltage, and configured to isolate the low voltage circuit from the second output voltage higher than a preset isolation voltage according to the preset isolation voltage when the high voltage circuit outputs the second output voltage; and a control circuit connected to the high voltage circuit and the low voltage circuit, and configured to respectively control the high voltage circuit and the low voltage circuit to generate the first output voltage and the second output voltage.

1. Name of the product in this design: Multi-pole connector. 2. Purpose of this design: For monitoring low-voltage circuit signals. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the key design points: Design 1 3D view. 5. Design 1 is designated as the basic design.

A circuit breaker protects an electric low-voltage circuit. The circuit breaker contains a housing with a grid-side connection and a load-side connection, and a mechanical separating contact unit which is connected to an electronic interruption unit in series. The mechanical separating contact unit can be switched by opening contacts to prevent a current flow or by closing the contacts for a current flow in the low-voltage circuit. Due to switching elements, the electronic interruption unit can be switched to a high-ohmic state of the switching elements to prevent a current flow or to a low-ohmic state of the switching elements for a current flow in the low-voltage circuit. The level of the current in the low-voltage circuit is ascertained. A process for preventing a current flow in the low-voltage circuit is initiated if current thresholds and / or current / time thresholds are exceeded.