84 results about "Low voltage circuits" patented technology

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 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 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.

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.

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.

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 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.

This invention relates to the field of power management technology. This application discloses a low-dropout voltage regulator circuit based on low-voltage devices adapted to high-voltage power supplies. To solve the problems of existing solutions requiring high-voltage devices, high cost, and inability to reuse low-voltage designs, this invention uses only low-voltage process devices. Overvoltage protection is achieved through a common-gate transistor with fixed gate bias, clamping the high-voltage input to a safe range. The control signal voltage is limited through a voltage divider clamping network. During power down, a voltage divider design is used to simultaneously turn off the power supply and ground switches. A pull-up start-up circuit to prevent degeneracy is also integrated. This circuit can directly convert a high-voltage input into a stable low-voltage output, driving ordinary low-voltage circuits without any modification, realizing the direct reuse of low-voltage designs in high-voltage scenarios. This solution has the advantages of extremely low cost, high security, low power consumption, reliable startup, and full compatibility with standard low-voltage CMOS processes, greatly expanding the application boundaries of low-voltage processes.

The invention relates to a low-voltage BMS circuit and system and a vehicle, and belongs to the technical field of vehicle-mounted energy storage, and the low-voltage BMS circuit is characterized in that the positive electrode of a battery cell module is connected to a generator and a complete machine load; the negative electrode of the battery cell module is connected to the power discharging NMOS module and the power charging NMOS module, and is connected to the positive electrodes of the two super capacitors which are connected in series through a unidirectional power diode; the negative electrode of the super capacitor is connected to the generator and the complete machine load through the charge and discharge load throwing switch NMOS and the charge and discharge load throwing NMOS driving circuit module; the voltage acquisition module is connected to the two super capacitors and is used for acquiring voltage values of the two super capacitors; and the MCU is used for controlling the opening and closing states of the charging load throwing switch NMOS and the discharging load throwing switch NMOS based on the voltage values of the two super capacitors. According to the invention, low-cost and reliable BMS protection can be realized.

The invention relates to an indoor intelligent environment control system in the technical field of intelligent supervision. The indoor intelligent environment control system comprises a main logic control circuit and an output control end circuit. According to the invention, interconnection and intercommunication of information data of a supervision place and electric equipment are realized in a mode of combining RS485 communication, wireless radio frequency communication, Bluetooth communication and wired Ethernet communication. Real-time networking of all prison rooms and a master control room is achieved through combination of wired Ethernet communication and RS485 communication, environment parameters in all prison rooms are collected in a centralized mode, devices in all prison rooms are accurately controlled, real-time networking, collection and sending of the environment parameters in the prison rooms are achieved through combination of RS485 communication, wireless radio frequency communication and Bluetooth communication in the prison rooms, and real-time monitoring of the prison rooms is achieved. And data support is provided for control equipment. Physical networking of electric equipment in a prison room is achieved, the power supply system is controlled to be turned on and turned off through the low-voltage circuit, and therefore operation of the electric equipment is controlled. And the voltage regulating module is controlled to work through pulse output of the control port, so that the electric equipment is controlled to operate.

The invention relates to a protective switching device for a low-voltage circuit, in which the magnitude of the current and voltage of the low-voltage circuit is determined periodically. On the one hand, the magnitude of the current determined in a first cycle is compared with a first current threshold value, in the case of which the first time window with a first duration is started, in which the effective value of the determined voltage is compared with a first voltage threshold value, in the case of which, in the case of undershooting the first voltage threshold value, a first information display is carried out. On the other hand, the effective value of the magnitude of the current determined in a second cycle is compared with a second current threshold value, in the case of which the second time window is started, in which, after the start of the second time window and after the first duration has elapsed, the effective value of the determined voltage is compared with the first voltage threshold value, in the case of which, in the case of undershooting the first voltage threshold value, a second information display is carried out.

The utility model belongs to the technical field of electrical control, and provides a new energy European box transformer substation circuit which comprises a main transformer, the high-voltage side of the main transformer is connected with a high-voltage line, the low-voltage side of the main transformer is connected with a low-voltage line, and the low-voltage side of the main transformer is further connected with a cooling line. The cooling circuit comprises a knife fuse switch, an auxiliary transformer, a first miniature circuit breaker, a second miniature circuit breaker, a third miniature circuit breaker, a transformer body heat dissipation fan and a transformer chamber grading starting heat dissipation fan, and the first miniature circuit breaker is provided with an under-voltage release accessory; and the first miniature circuit breaker is connected with a frame circuit breaker secondary control loop of a low-voltage line through an under-voltage release auxiliary contact. According to the utility model, the phenomenon that the main transformer runs at high temperature and is burnt out due to the loss of a working power supply of the heat dissipation fan because the overall damage of the box transformer or the loss of an auxiliary secondary power supply in the box transformer caused by the burning and fault of the auxiliary transformer can be reduced or prevented.

A circuit breaker protecting an electric low-voltage circuit includes grid-side and load-side connections for low-voltage circuit conductors, a mechanical isolating contact unit having a closed contact state for current flow or an open contact state for DC isolation preventing current flow in the low-voltage circuit. An electronic interruption unit series-connected to the isolating contact unit has a high-ohmic state of switching elements preventing current flow or a low-ohmic state allowing current flow in the low-voltage circuit. The current level of the low-voltage circuit is ascertained, and upon exceeding current limit values or current / time limit values, current flow in the low-voltage circuit is prevented. After preventing current flow by a high-ohmic state of the switching elements and closed state of the contacts, at least one electric parameter at least at one load-side connection is checked.

Embodiments of the present disclosure relate to regulator circuits, corresponding systems, and methods. A circuit includes an electronic switch configured to be coupled between a high voltage node and a low voltage circuit device and configured to couple the low voltage circuit device to the high voltage node. A voltage sense node is configured to be coupled to the high voltage node via a pull-up resistor. Another electronic switch can be switched to an on state to couple the voltage sense node and a control node of the electronic switch. A comparator compares a threshold to a voltage at the voltage sense node and turns on the other electronic switch in response to the voltage at the voltage sense node reaching the threshold. A charge pump coupled to a current flow path of the electronic switch is activated to an on state to pump charge from the current flow path of the electronic switch to the control node of the electronic switch via the other electronic switch switched to the on state.

The electric system (of a road vehicle and having: a high-voltage electrical circuit provided with a storage system and with at least one electric machine designed to generate electrical energy; a low-voltage electrical circuit provided with at least one continuous electrical load which must be powered even when the vehicle is in a parking condition and at least one occasional electrical load which must not be powered even when the vehicle is in the parking condition; a main electronic DC-DC power converter which connects the low-voltage electrical circuit and the high-voltage electrical circuit to power all electrical loads; and secondary electronic DC-DC power converter which is completely separate from and independent of the main electronic DC-DC power converter and connects the low-voltage electrical circuit and the high-voltage electrical circuit to one another so as to power only and exclusively the continuous electrical load.

A phlebotomy aid provides a capability to expand circulatory members for emphasizing venous appearance and accessibility on an epidermal surface. A warming sheath or sleeve extends over a patient forearm for introducing a thermal source adjacent to a patient blood vessel for emphasizing the vein appearance on the epidermal surface. A beating element in the sleeve is powered and controlled by a low voltage circuit for controlled thermal introduction for mitigating discomfort from overheating and eliminating proximity of potentially harmful electrical exposure.

The application relates to a non-intrusive low-voltage circuit breaker state sensing device which comprises an Internet of Things communication module, a sampling module and a calculation module; the Internet of Things communication module is responsible for communication with a district side device and uploading a circuit breaker state; the sampling module is responsible for collecting voltage and current data around the circuit breaker through a voltage and current transformer; and the calculation module is responsible for sensing the circuit breaker state according to the data collected by the sampling module, which can not only distinguish the opening and closing states of the circuit breaker, but also distinguish short-circuit tripping and non-short-circuit tripping, and further evaluate the operation life of the circuit breaker.

The application relates to a low-voltage circuit control method, device, equipment, storage medium and system, and relates to the technical field of vehicle control. The method is applied to a power management unit in a low-voltage circuit control system, and the method comprises the following steps: in the case that the current of the low-voltage circuit is greater than a preset current, judging whether a fault point of the low-voltage circuit control system is located in a second low-voltage circuit according to the voltage across the power management unit. Then, in the case that the fault point is not located in the second low-voltage circuit, controlling a direct-current converter to be disconnected, and determining the on-off state of the power management unit according to the current of the low-voltage circuit after the direct-current converter is disconnected, so that the second low-voltage circuit can at least work normally. In the case that the fault point is located in the second low-voltage circuit, controlling the power management unit to be in a disconnected state, so that the first low-voltage circuit can work normally. Meanwhile, the low-voltage circuit control system is composed of a single storage battery and a single direct-current converter, and the cost can be effectively reduced.

The utility model provides an arc extinguishing device of a low-voltage circuit breaker, which relates to the technical field of circuit breakers, and comprises a plurality of grid sheets and a grid sheet mounting rack which are arranged in sequence, the grid sheet mounting rack is used for mounting and supporting all the grid sheets, and the plurality of grid sheets form an arc extinguishing chamber; the number of the grid pieces is N, and the grid pieces are the first grid piece, the second grid piece,..., and the Nth grid piece. The central grid sheet is vertically arranged, the central grid sheet is used as a center axis, and the other grid sheets are arranged in a fan shape by taking the central grid sheet as a symmetry axis; according to the utility model, under the condition that the number of the grid sheets is not increased additionally, a fan-shaped arrangement structure is adopted, and the arc guide channels are arranged on the grid sheets, so that electric arcs can enter the arc extinguishing cover in an accelerated manner, the internal spaces of the grid sheets are gradually narrowed, and short arcs are shortened in an accelerated manner in the advancing process, thereby shortening the arc extinguishing time of the grid sheets and improving the arc extinguishing efficiency. And meanwhile, the arc extinguishing capability of the circuit breaker under large fault current is improved.