14 results about "Low-voltage detect" patented technology

The application discloses a solar array simulator equalization power supply and distribution control system, and relates to the technical field of solar energy, which comprises a first photovoltaic module, a second photovoltaic module, a low-voltage detection module, an electric energy transmission module, a voltage stabilizing module, a first energy storage module, a second energy storage module, an isolation voltage transformation module, an equalization module and a micro-control module. The solar array simulator equalization power supply and distribution control system can improve energy storage efficiency and control voltage balance, improve the utilization rate of electric energy and prolong the service life.

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 switch device for a hazardous voltage interlockloop has a first connector, provided at an input end of the hazardous voltage interlockloop; and a second connector, provided at an output end of the hazardous voltage interlockloop. The second connector is capable of being fitted to the first connector; the first connector has a locking lever, the locking lever being pivotably provided on a housing of the first connector, the second connector has a pressing unit, a movable contact, and an elastic unit. When the first connector and the second connector are in a fitted state, the locking lever abuts against the pressing unit. When the locking lever is pivoted to a locked position, the pressing unit moves to a first position in a linked manner, and the pressing unit enables the elastic unit to be in a compressed state, and the movable contact is in contact with a low-voltage detect contact of the switch device. When the locking lever is pivoted to an unlocked position, the pressing unit moves to a second position in a linked manner, and the elastic unit is in an extended state, and the movable contact is separated from the low-voltage detect signal contact.

The invention discloses a voltage protection circuit. The protection circuit comprises a high-voltage detection circuit, a low-voltage detection circuit, a logic control circuit, a time delay circuit and an on-off execution circuit, the output end of the high-voltage detection circuit and the output end of the low-voltage detection circuit are respectively connected to the input end of the logic control circuit, and the output end of the logic control circuit is connected to the control end of the on-off execution circuit through the time delay circuit; the circuit is used for stably outputting an input voltage to a load end in a normal range, when the input voltage exceeds a preset high-voltage or low-voltage threshold value, the output is automatically cut off, a visual alarm is provided through the state indication circuit, and the circuit can be used for realizing the intelligent control of the input voltage through a precise voltage detection module, a logic control module, a delay filtering module and an on-off execution module. The problems that in the prior art, protection precision is not high, response characteristics are not ideal, and adaptability to transient voltage fluctuation is poor are solved.

A wireless photoelectric sensor disclosed by the present invention comprises a PCB, the PCB is provided with a radio frequency emission circuit, a charging chip, a power supply management circuit and a low-voltage detection circuit which are connected with a single-chip microcomputer, the radio frequency emission circuit is wirelessly connected with a radio frequency receiver through a radio frequency antenna, and the output end of a rechargeable battery is electrically connected with the input end of the low-voltage detection circuit. The output end of the single-chip microcomputer is electrically connected with the input end of the low-voltage indicating lamp, the output end of the radio frequency antenna is electrically connected with the input end of the working indicating lamp, and the output end of the charging chip is electrically connected with the input end of the charging indicating lamp. The work indicating lamp is turned on or turned off according to whether the radio frequency emission circuit emits a signal through the radio frequency antenna or not, an initial result is displayed to an operator, and meanwhile, the sensor can work without being connected with an external fixed power supply through combination of the power supply management circuit and the rechargeable battery; therefore, the use effect of the photoelectric sensor is prevented from being affected by cable connection in the actual use process.

The invention provides an alternating current power supply equipment fault detection circuit and method and alternating current power supply equipment. The detection circuit comprises a main circuit unit, a signal sampling and processing unit and a detection and judgment unit. In the main circuit unit, a first electronic switch is connected in series with a live wire input and output end, a second electronic switch is connected in series with a zero wire input and output end, and both receive the same control signal. The third electronic switch is connected in series between the low-voltage direct-current power supply and the current-limiting resistor, and the current-limiting resistor is connected with the output end of the null line to control injection and disconnection of a low-voltage detection signal; the signal sampling and processing unit comprises a voltage-dividing sampling module, a clamping module, an impedance matching module, a rectification filtering module, a signal amplification module and a low-pass filtering module which are used for processing sampled signals in sequence; and the detection and judgment unit is connected with the low-pass filtering module and realizes adhesion detection of the electronic switch in combination with self signal characteristics and on-off states of the first switch and the third switch, the circuit reusability is high, and the detection is efficient.

Disclosed is a reset circuit including a low voltage detecting circuit receiving a power signal and outputting a signal, the low voltage detecting circuit including a first cell configured to receive the power signal and output the voltage corresponding to the logic “0” based on the power signal being smaller than a threshold voltage or a voltage corresponding to logic “1” based on the power signal being greater than the threshold voltage, at least one second cell connected in series to the first cell and outputting a signal inputted from the first cell after delaying the signal for a predetermined delay time, and a third cell outputting a low voltage reset signal by receiving all signals outputted from the first cell and the at least one second cell.

The utility model discloses a high-voltage starting circuit of a switching power supply chip, a switching power supply circuit and a charger. The high-voltage starting circuit of the switching power supply chip comprises a high-voltage starting end, a main power supply end, a constant current source module, a phase detection module and a low-voltage detection module. The phase detection module is connected with the high-voltage starting end and is used for outputting a first detection signal when the phase of a first power supply signal received by the high-voltage starting end is within a preset phase range; and the low-voltage detection module is connected with the main power supply end and is used for outputting a second detection signal when the voltage of a second power supply signal received by the main power supply end is smaller than a first preset voltage. The phase detection module in the high-voltage starting circuit can charge the main power supply end only when the phase of the received first power supply signal is within the preset phase range, so that excessive loss caused by direct charge through the high-voltage starting end can be avoided, and the input power is ensured not to generate large fluctuation.

The application discloses a kind of bus short-circuit isolation circuit and fire alarm system, for realizing the short-circuit isolation of annular loop fire-fighting equipment on fire-fighting bus, comprising: low-voltage detection module is used to detect the low voltage drop signal on fire-fighting bus when short-circuit occurs, triggering module is used to turn on after receiving low voltage drop signal, switch control module is used to cut off according to on signal to make the negative end of short-circuit isolator high resistance state;Or, switch control module is used to detect the short-circuit signal at short-circuit isolator when short-circuit occurs, switch control module is cut off according to short-circuit signal, triggering module is used to keep the cut-off state of switch control module to make the negative end of short-circuit isolator high resistance state;When short-circuit is removed, triggering module is used to receive short-circuit removal signal, and switch control module is used to turn on according to short-circuit removal signal to make the negative end of short-circuit isolator low resistance state.The application effectively improves the communication stability of fire alarm system.

The application provides a detection circuit and a vehicle. The detection circuit comprises a controlled element and a control element. One end of the controlled element is connected with the control circuit, and the other end of the controlled element is grounded. One end of the control element is connected with the first end of a low-voltage detection connector, and the other end of the control element is connected with the second end of the low-voltage detection connector. The control element controls the on-off of the controlled element according to the connection state of the low-voltage detection connector, so that the controlled element outputs a corresponding detection signal to the control circuit. The control circuit determines the on-off state of the high-voltage interlocking loop and the connection state of the low-voltage detection connector based on the detection signal. The circuit can convert the connection state of the low-voltage detection connector into a high-low level detection signal recognizable by the control circuit, so as to accurately know the fault position and the on-off state of the high-voltage interlocking loop, and improve the detection and troubleshooting efficiency and the detection reliability.

This invention discloses a safe and regulated power supply circuit for an MCU, relating to the field of MCU power supply technology. It includes a first voltage regulator module and a second voltage regulator module, which respectively provide the required multi-channel regulated power to the MCU module. An output detection module performs high-voltage or low-voltage detection on the first and second voltage regulator modules according to set high-voltage and low-voltage thresholds. When the first voltage regulator module experiences high or low voltage, a current amplification module controls the first voltage regulator module to power off and performs current amplification processing on the second voltage regulator module, so that the second voltage regulator module can maintain multi-channel power supply to the MCU module. Conversely, when the second voltage regulator module experiences high or low voltage, the second voltage regulator module is powered off and the first voltage regulator module performs current amplification processing to maintain multi-channel power supply to the MCU module. Compared with the prior art, the beneficial effects of this invention are: the safe and regulated power supply circuit for the MCU module improves the power supply safety and efficiency for the MCU module.

The application relates to a cellular intelligent commutation power distribution system and relates to the technical field of electrical equipment, which comprises a circuit control module for monitoring and controlling the circuit connection mode and a cellular driving group for responding to the circuit control module, and a plurality of driving modules are arranged in the cellular driving group, each driving module comprises a mounting box made of insulating material, and each mounting box is provided with a closing and opening assembly, an overload protection assembly, an anti-jumping locking assembly and a low-voltage detection assembly. The overload protection assembly is used for protecting the accessed current, the closing and opening assembly is used for responding to the circuit control module to disconnect or connect the circuit, the anti-jumping locking assembly is used for ensuring that the closing and opening assembly correctly closes or opens, and the low-voltage detection assembly is used for disconnecting the circuit when the closing and opening assembly cannot normally operate. The application can effectively monitor and control the circuit connection mode, realizes intelligent commutation power distribution, simultaneously has the effects of overload protection, anti-jumping locking and low-voltage detection, and guarantees the stable and reliable operation of the system.

This utility model relates to the field of battery pack technology, and discloses a coolant leakage detection device, a battery pack, and an electrical device. By utilizing the low-voltage detection circuit and two detection lines of the BMS within the battery pack, it can accurately determine that the insulation failure is caused by coolant leakage, avoiding situations where high-voltage leakage from other parts is the cause, thus facilitating fault diagnosis. Furthermore, because the voltage of the low-voltage detection circuit is relatively low, the breakdown voltage of the air gap is relatively high. Even with a small electrical gap, it is not easily broken down under normal operating voltage. Therefore, the second ends of the two mutually insulated detection lines can be positioned close to the bottom of the battery pack via a fixing component, achieving more effective coolant leakage detection and improving detection sensitivity and accuracy. In addition, it has the advantages of real-time detection and rapid response, and its structure is relatively simple and easy to install.

The application provides a fault detection system and a vehicle. The fault detection system comprises a plurality of conversion modules, a plurality of detection modules, a plurality of signal processing modules and a control module. Each conversion module is capable of outputting a corresponding electrical signal based on the connection state of a low-voltage detection connector. The plurality of detection modules receive the electrical signal and output corresponding detection signals based on the electrical signal. The plurality of signal processing modules receive the detection signals. The control module receives the detection signals processed by the plurality of signal processing modules. The control module determines the on-off state of a high-voltage interlocking loop and the connection state of the plurality of low-voltage detection connectors based on the plurality of detection signals. The system can convert the connection state of the low-voltage detection connector into a high-low level detection signal recognizable by the control module, so that the control module can accurately know the fault location and the on-off state of the high-voltage interlocking loop based on the detection signal, improving the detection and troubleshooting efficiency and having high detection reliability.