160 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.

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.

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 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 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.

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.

A circuit breaker protects an electric low-voltage circuit and contains a mechanical separating contact unit, which has an open state of its contacts in order to prevent a current flow in the low-voltage circuit or a closed state of the contacts for a current flow in the low-voltage circuit, and an electronic interruption unit, which is connected in series to the mechanical separating contact unit on the circuit side and which, as a result of semiconductor-based switch elements, has a high-ohmic state of the switch elements in order to prevent a current flow or a low-ohmic state of the switch elements for a current flow in the low-voltage circuit. The level of the current of the low-voltage circuit is ascertained, and if at least one current threshold or a current / time threshold is exceeded, a process for preventing a current flow in the low-voltage circuit is initiated.

The utility model discloses a bridge contact device of a low-voltage circuit breaker, which belongs to the technical field of circuit breakers, and comprises a circuit breaker body, one side of the circuit breaker body is clamped with a contact piece body, the outer surface of the circuit breaker body is fixedly connected with a fixed plate, a clamping structure is arranged in the fixed plate, and the contact piece body is clamped with the clamping structure. One side of the contact piece body is provided with a locking structure, the locking structure is connected with a circuit breaker body, the locking structure comprises a cross plate, an auxiliary plate and a first inclined plate, and the upper part of the first inclined plate is fixedly connected with a moving rod. According to the utility model, through the arrangement of the circuit breaker body, the contact piece body, the locking structure and the cross-shaped groove, the contact head device enables the contact piece body and the circuit breaker body to realize the function of rapid assembly through the cooperation of the first inclined plate, the spring and the second inclined plate, and can be independently replaced in time when being damaged; the overall use efficiency and reliability of the circuit breaker body are guaranteed, and the breaking capacity of the circuit breaker is improved.

The invention relates to a protective switching device for protecting a low-voltage circuit, comprising: a mechanical disconnecting contact unit which is connected in series with an electronic interrupting unit, the series circuit being connected, on the one hand, to at least one network-side connection and, on the other hand, to at least one load-side connection; the method comprises the steps of:-determining the magnitude of the current of the low-voltage circuit,-initiating an avoidance of the current flow of the low-voltage circuit when a current limit value or / and a current-time limit value are / is exceeded,-determining the temperature in the protection switching device, in particular the temperature of the electronic interruption unit, in particular the temperature of at least one of the semiconductor-based switching elements, and switching the electronic interruption unit to a high ohmic state of the switching element for avoiding the current flow when the first temperature threshold value is exceeded in order to avoid overheating of the protection switching device.

A power module that utilizes high-temperature gate drivers with optical fiber-based isolators. The power module includes a gate driver, which includes one or more optical fiber-based isolators configured to provide electrical isolation between low-voltage circuitry and power devices of the power module. Furthermore, the gate driver includes an amplifier configured to enhance a control signal. Additionally, the gate driver includes a gate driver integrated circuit configured to provide voltage and current to drive the power devices of the power module based on the control signal. Furthermore, the gate driver is fabricated on a substrate, such as a low-temperature co-fired ceramic substrate. As a result, the power module with the optical fiber-based isolator allows for a wide range of operation temperatures and fast switching frequency.

A circuit breaker device protects an electrical low-voltage current circuit. The level of a current of the low-voltage current circuit is ascertained periodically such that current values are provided incrementally. The level of the voltage of the low-voltage current circuit is ascertained periodically such that voltage values are provided incrementally. The change in the current is ascertained from the periodically ascertained current values over time such that current change values are provided incrementally, and a differential voltage is ascertained from the periodically ascertained voltage values and an expected value of the voltage such that differential voltage values are provided incrementally. Each current change value is compared with a second threshold, and each differential voltage value is compared with a first threshold. If the first and second thresholds are exceeded, an interruption of the current circuit is initiated by switching elements being set to a high-ohmic state.

1. Name of the product in this design: Low-voltage circuit breaker. 2. Application of this design: for use in low-voltage circuit breakers. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention relates to a protection circuit of a low-voltage circuit, electronic equipment and a vehicle, and the protection circuit is connected between a low-voltage power supply end of a low-voltage working circuit and a protected circuit, and carries out the state switching of the protected circuit according to the voltage change of the low-voltage power supply end. Wherein the voltage change is generated under the condition that a high-voltage power supply end of a high-voltage working circuit is electrically coupled to the low-voltage power supply end. According to the technical scheme, the state switching of the protected circuit is automatically triggered on the basis of capturing the voltage change on the low-voltage power supply end and generated under the condition that the high-voltage power supply end of the high-voltage working circuit is electrically coupled to the low-voltage power supply end in real time, so that the normal working condition and the risk scene are intelligently distinguished; safe operation of a low-voltage circuit in a complex high-voltage environment is ensured, and system reliability and service life are improved.

The invention discloses an extended-range motorcycle based on a double-hub motor. The extended-range motorcycle is composed of a vehicle control unit (VCU), a front hub motor, a rear hub motor, a range extender, a generator and the like. The vehicle uses a VCU to realize whole vehicle control, control objects comprise a front hub motor, a rear hub motor, a range extender, a generator and the like, and a whole vehicle control circuit is constructed. The vehicle can autonomously set the SOC value of the battery, the VCU detects the electric quantity of the battery to control the start and stop of the range extender, the range extender drives the generator to operate to charge the battery, when the vehicle is in a downhill or deceleration state, the battery can be reversely charged through the kinetic energy recovery function of the front hub motor and the rear hub motor, and the vehicle detects the opening degree of an electric door through the VCU to supply power to the front hub motor and the rear hub motor. And a whole-vehicle high-voltage circuit is constructed. According to the vehicle, the electric quantity of the storage battery is detected through the VCU to control the generator to charge the storage battery, when the vehicle is parked for a long time and the storage battery is lack of electricity, the battery is controlled through the VCU to directly supply power to the storage battery, the storage battery is controlled through the VCU to supply power to accessories of the whole vehicle, and a low-voltage circuit of the whole vehicle is constructed.