71 results about "Low-voltage detect" patented technology

The utility model provides a high-voltage interlocking detection system and a vehicle. The high-voltage interlocking detection system comprises a detection circuit, a plurality of signal processing modules and a control module. The detection circuit comprises a plurality of detection branches connected in series, the plurality of detection branches are correspondingly connected with the plurality of low-voltage detection connectors, and the detection branches output detection signals based on the connection states of the low-voltage detection connectors; the plurality of signal processing modules receive detection signals from the plurality of detection branches; and the control module determines the on-off state of the high-voltage interlocking loop and the connection state of the plurality of low-voltage detection connectors based on the detection signals processed by the plurality of signal processing modules. In the system, a plurality of detection branches are connected with a control module through different signal processing modules, wire harnesses are separated from one another, and a plurality of signal processing modules process a plurality of detection signals and then uniformly send the signals to the control module through a common node, so that the arrangement of the wire harnesses is reduced while reliable transmission of the signals is ensured, and the cost is reduced. And the whole circuit of the system is simplified.

The invention discloses a grid-connected and off-grid safety control circuit for a photovoltaic inverter, and relates to the technical field of photovoltaic grid-connected and off-grid, and the circuit comprises a photovoltaic adjustment module which is used for photovoltaic conversion and power adjustment; the photovoltaic detection module is used for performing low-voltage detection on the photovoltaic detection module; the temperature detection module is used for performing over-temperature detection; the intelligent control module is used for signal receiving and module control; the multi-level inversion module is used for carrying out energy storage boosting, self-voltage-sharing and inversion work and carrying out energy storage boosting and inversion work in cooperation with the inversion adjusting module; the adjustment switching module is used for controlling the working states of the multi-level inversion module and the inversion adjustment module; the inversion adjusting module is used for transmitting electric energy; the alternating-current power grid module is used for receiving electric energy and connected with an alternating-current power grid. According to the grid-connected and off-grid safety control circuit of the photovoltaic inverter, the voltage gain can be improved, the voltage distortion of the output end can be avoided, the electric energy loss and the working temperature of a switching tube element can be reduced in low voltage or over-temperature, and the safety of the circuit can be improved.

The utility model provides a high-voltage interlocking detection system and a vehicle. The high-voltage interlocking detection system comprises a detection circuit and a microcontroller. The detection circuit comprises a plurality of detection branches connected in series, the plurality of detection branches are correspondingly connected with the plurality of low-voltage detection connectors, and the detection branches output corresponding detection signals based on the connection states of the low-voltage detection connectors; the microcontroller is connected with the plurality of detection branches to receive detection signals from the plurality of detection branches, and the microcontroller determines the on-off state of the high-voltage interlocking loop and the connection state of the plurality of low-voltage detection connectors based on the plurality of detection signals. According to the system, the detection signals of different detection branches are received and processed through the same microcontroller, the response speed is high, the multiple detection signals are received through the same microcontroller, the synchronism of receiving the detection signals is high, the detection real-time performance and the detection accuracy of the microcontroller are guaranteed, additional sub-control units do not need to be arranged, and the cost is low. The manufacturing cost is saved, and the system structure is simplified.

The invention discloses a solar power generation voltage regulation circuit, which relates to the technical field of solar power generation and comprises a solar module used for photoelectric conversion, voltage regulation and output of first electric energy; the solar control module is used for sampling voltage and comparing the voltage with a first low-voltage threshold value, a second low-voltage threshold value and a charging threshold value which are set; the charging and discharging control module is used for controlling transmission of electric energy and charging and discharging of the energy storage control module; the energy storage control module is used for storing energy and boosting and discharging; the power supply control module is used for electric energy superposition control; the output module is used for receiving the electric energy and supplying power to connected electronic equipment; the output detection module is used for low-voltage detection; and the intelligent control module is used for signal receiving and module control. The solar power generation voltage regulation circuit can maintain power supply requirements in different power supply states, improve the utilization rate of solar energy and avoid energy waste.

The utility model provides a high-voltage interlocking detection system and a vehicle, the system is applied to a high-voltage interlocking loop with a plurality of low-voltage detection connectors, and the high-voltage interlocking detection system comprises a plurality of detection branches, a plurality of signal processing modules and a control module. The plurality of detection branches are connected with the plurality of low-voltage detection connectors in a one-to-one correspondence manner; the detection branch is used for sampling the low-voltage detection connector and outputting a detection signal based on a sampling signal obtained by sampling; the plurality of signal processing modules are respectively connected with the adjacent detection branches in a one-to-one correspondence manner, and are used for receiving the detection signals; the control module is connected with the plurality of signal processing modules so as to obtain the detection signals; and the control module is used for determining the working state of the low-voltage detection connector based on the detection signal. The problems that multiple wire harnesses connected to the detection module and the control module in a high-voltage interlocking detection system are overlapped and wound, connection is complex, and potential safety hazards exist are solved.

The utility model provides a high-voltage interlocking detection system and a vehicle, the system is applied to a high-voltage interlocking loop with a plurality of low-voltage detection connectors, and the high-voltage interlocking detection system comprises a plurality of detection branches and a control module. The plurality of detection branches are connected with the plurality of low-voltage detection connectors in a one-to-one correspondence manner; the detection branch is used for sampling the low-voltage detection connector and outputting a detection signal based on a sampling signal obtained by sampling; the control module is connected with the plurality of detection branches so as to receive the detection signals; and the control module is used for determining the working state of the low-voltage detection connector based on the detection signal. According to the invention, the general control module is connected with the plurality of detection branches, the centralized processing of the detection signals detected by the plurality of detection branches can be realized, when the system needs to be expanded, only a new detection branch needs to be added, and a new control unit does not need to be added, so that the system expansion efficiency is improved. And the expandability of the high-voltage interlocking detection system is effectively improved.

An embodiment of the present invention provides a safety detection device, which includes a near-electricity detection unit, a communication unit and a data processing unit; the near-electricity detection unit includes a sensing circuit, a detection chip and a signal adjustment module; the sensing circuit is used to receive an electric field signal at a specified position, the detection chip is used to perform noise reduction and signal amplification processing on the electric field signal into a voltage signal, and the signal adjustment module is used to convert the voltage signal into a digital signal; the data processing unit is used to judge the electric field safety status at the specified position; the detection chip includes an adaptive circuit, at least one low-voltage detection chip and at least one high-voltage detection chip. The safety detection device provided by the embodiment of the present invention can be simultaneously applicable to electric field detection of multiple voltage circuits, effectively improving the adaptability and efficiency of the detection.

The utility model discloses a vehicle-mounted low-cost storage battery high and low voltage detection circuit, which comprises a battery input end, a detection interruption output end, a high voltage detection judgment circuit, a low voltage detection judgment circuit and a level conversion circuit. According to the utility model, when the voltage of the storage battery is in a normal working range, a low level is output to the MCU; and when the voltage of the storage battery exceeds a normal working range, a high level is output to the MCU, so that the problems that AD sampling always occupies MCU resources to influence the running speed of the system and the real-time performance is low are solved, and the circuit cost is greatly reduced.

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.

The invention relates to the technical field of power supply management, and discloses a low-voltage detection circuit, and the circuit comprises a bias current unit which comprises a current mirror structure and is configured to mirror a reference current to generate a tail current; the delta Vth compensation low-voltage detection unit is respectively connected with the bias current unit, reference voltage and power supply voltage, and comprises a first PMOS (P-channel Metal Oxide Semiconductor) tube, a sixth NMOS (N-channel Metal Oxide Semiconductor) tube and a fifth NMOS tube which are sequentially connected in series, and a seventh NMOS tube which is bridged at the drain end and the source end of the sixth NMOS tube; wherein the source electrode of the first PMOS tube is connected with a power supply voltage, the source electrode of the fifth NMOS tube is connected with a tail current, and the grid electrodes of the first PMOS tube, the sixth NMOS tube and the fifth NMOS tube are all connected with a reference voltage; the grid electrode and the source electrode of the seventh NMOS tube are respectively connected with the drain electrode and the source electrode of the sixth NMOS tube, and the drain electrode of the seventh NMOS tube is connected with the power supply voltage; and the input end of the low-voltage alarm signal rectification phase inverter is connected with the grid electrode of the seventh NMOS tube, and the low-voltage alarm signal rectification phase inverter rectifies the detection voltage and outputs a low-voltage detection alarm signal. The circuit is small in area and low in static power consumption. The invention also discloses a chip.

The invention provides a power supply system and electronic equipment. The power supply system comprises a power supply control module, an over-current detection module, a low-voltage detection module, an AND gate logic module, a power supply module and a control unit. The power supply control module is respectively connected with the first resistor, the first NMOS tube, the second resistor, the gate logic module, the first NMOS tube and the second NMOS tube; the first NMOS tube is also respectively connected with the second NMOS tube and the power supply module; the power supply module is also connected with the control unit; the control unit is also connected with the over-current detection module and the low-voltage detection module; the second NMOS tube is also connected with the over-current detection resistor and the over-current detection module; the over-current detection resistor is also connected with the over-current detection module and the low-voltage detection module; the AND gate logic module is also connected with the over-current detection module and the low-voltage detection module; the invention provides a power supply system with relatively high safety performance, and various fault protection such as reverse connection, low voltage, overvoltage, overcurrent and the like of an equipment battery is realized; and the frequency of replacing the fuse after a fault occurs is reduced.

The invention discloses a cable water tree aging positioning method based on a dielectric spectrum diagnosis technology, and the analysis method comprises the following steps: 1), carrying out the dielectric spectrum test of a to-be-detected cable, and analyzing a detection result; 2) if the detection data has a layering phenomenon, the cable to be detected has an aging phenomenon; 3) performing low-voltage-high-voltage-low-voltage detection on the cable to be detected, and analyzing a detection result; 4) if the hysteresis reaction exists, determining that the water tree is aged, and if the hysteresis reaction does not exist, determining that the water tree is thermally aged; and 5) if water tree aging occurs, applying direct current voltage to two ends of the cable, performing dielectric spectrum testing again, analyzing detection data, and obtaining a conclusion. According to the method, aging types are classified according to the hysteresis response of water tree aging in the dielectric spectrum testing, water tree aging phenomenon fault points are positioned, and meanwhile, the integrity of the cable structure is ensured.

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 discloses an automatic voltage equalization control circuit for a solar battery pack, which relates to the technical field of solar batteries and comprises a second photovoltaic module used for photoelectric conversion and energy storage; the first photovoltaic module is used for photoelectric conversion, energy storage and electric energy superposition; the third photovoltaic module is used for photoelectric conversion, energy storage and electric energy superposition; the battery detection module is used for performing low-voltage detection and voltage sampling; the micro-control module is used for signal receiving and module control; the electric energy control module is used for controlling transmission of electric energy and supplying power to the charging and discharging module; the charging and discharging module is used for storing energy and providing balanced electric energy; and the equalization module is used for performing electric energy equalization distribution control according to the voltage of the first photovoltaic module, the second photovoltaic module and the third photovoltaic module. The automatic voltage equalization control circuit of the solar battery pack can automatically perform voltage equalization adjustment processing, improve the solar power supply efficiency, improve the energy utilization rate and shorten the charging duration required by full power.

The utility model provides a fault detection system and a vehicle. The fault detection system comprises a plurality of conversion modules, a first control module and a second control module. Each conversion module can output a corresponding detection signal based on the connection state of the low-voltage detection connector; the first control module receives detection signals from the plurality of conversion modules; and the second control module receives the plurality of detection signals processed by the first control module, and is used for determining the on-off state of the high-voltage interlocking loop and the connection state of the plurality of low-voltage detection connectors based on the plurality of detection signals. The fault detection system can convert the connection state of the low-voltage detection connector into a level detection signal which can be identified by the first control module and the second control module, so that the second control module can accurately know the fault position and the on-off state of the high-voltage interlocking loop based on the detection signal, the detection and troubleshooting efficiency is improved, and the detection reliability is high.

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 balanced power supply and distribution control system for a solar array simulator, and relates to the technical field of solar energy, and the system comprises a first photovoltaic module which is used for photoelectric conversion and electric energy superposition and transmission; the second photovoltaic module is used for photoelectric conversion and electric energy transmission; the low-voltage detection module is used for performing voltage detection on the first photovoltaic module and the second photovoltaic module which are connected in series; the electric energy transmission module is used for electric energy transmission control; the voltage stabilization module is used for voltage stabilization adjustment; the first energy storage module is used for power storage, power supply, electric energy superposition and electric energy two-way transmission control; the second energy storage module is used for power storage, power supply and electric energy two-way transmission control; the isolation voltage transformation module is used for isolation voltage transformation and high-frequency voltage regulation; the equalization module is used for electric energy two-way transmission control; and the micro-control module is used for signal receiving and module control. The balanced power supply and distribution control system for the solar array simulator can improve energy storage efficiency, control voltage balance, improve the utilization rate of electric energy and prolong the service life.

The utility model discloses an automobile chassis power supply detection device, which is provided with a chassis storage battery, and the positive electrode of the chassis storage battery is electrically connected with a chassis power supply main switch, a main power supply fuse and a main power supply switch in sequence. One end of the low-voltage detector is electrically connected with the negative electrode of the chassis storage battery, the other end of the low-voltage detector is electrically connected with a monitoring device fuse and a monitoring device switch in sequence, and the monitoring device switch is electrically connected with the main power switch through a wire. The utility model has the characteristics that the electrical principle is relatively simple, and the maintainability is better.

The invention provides a supply voltage detection circuit and a circuit system using the same. The supply voltage detection circuit is provided with a voltage detection circuit and a current clamping circuit. The voltage detection circuit receives a supply voltage and is used for detecting the supply voltage to generate a low-voltage detection signal. When the supply voltage is lower than a set level, the low-voltage detection signal output by the voltage detection circuit closes the current clamping circuit, and transistor current flowing through the voltage detection circuit is in direct proportion to the supply voltage; when the supply voltage is greater than or equal to the set level, the low-voltage detection signal output by the voltage detection circuit starts the current clamping circuit, and the current clamping circuit provides a fixed current to maintain the operation of the voltage detection circuit. Wherein the transistor current flowing through the voltage detection circuit is proportional to the fixed current. The supply voltage detection circuit provided by the invention has the characteristics of high accuracy, low temperature drift and low power consumption.

The present invention relates to the technical field of clock control, and discloses a clock control circuit, a power supply control circuit and an integrated circuit with high anti-interference performance. The clock control circuit includes a voltage detection unit, a NOR gate, an AND gate, a plurality of serially connected TFF flip-flops, a latch LAT and an OR gate; in actual use, the present invention detects the fluctuation of the power supply voltage through the voltage detection unit. When the power supply voltage changes upward or downward, the changed high-voltage detection signal or low-voltage detection signal will cause the latch LAT to stop outputting the clock signal through the serially connected TFF flip-flops. After the power supply voltage returns to normal, the serially connected TFF flip-flops will cause the latch LAT to continue outputting the clock signal after timing, so as to avoid generating abnormal clock signals by stopping the clock signal when the power supply voltage is abnormal, thereby improving the anti-interference performance of the clock control circuit.

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.

The novel hydrogen fuel cell comprises a hydrogen fuel cell body, a short message module, an ampere meter, a high-voltage detection circuit, a low-voltage detection circuit, a control circuit and a detection mechanism, the detection mechanism comprises a magnet and a reed switch, the magnet is installed at the rear side end of a pointer rotating shaft of the ammeter, and the reed switch is longitudinally installed at the rear side end of an ammeter shell at the rear upper end of the rotating shaft; and the short message module, the high-voltage detection circuit, the low-voltage detection circuit and the control circuit are arranged in the element box and are electrically connected. Based on the hydrogen fuel cell body, in the application, the high-voltage detection circuit and the low-voltage detection circuit can monitor the voltage output by the hydrogen fuel cell body in real time, and the control circuit, the detection mechanism, the ampere meter and the like can monitor the electrical load in real time; related workers can be prompted to overhaul and maintain in a short message mode, and stable and reliable work of the hydrogen fuel cell body is guaranteed.

The present invention relates to a low-voltage detection circuit for a PSI5 protocol synchronization pulse signal, which includes a transient circuit, a steady-state circuit, a comparison threshold generation circuit, and a low-voltage power supply terminal that provides a low-voltage regulated power supply signal. The transient circuit generates a transient voltage signal and a transient current signal based on a supply voltage signal, a synchronization pulse signal, and a first reference voltage. The steady-state circuit generates a steady-state voltage signal based on the transient voltage signal. The comparison threshold generation circuit generates a comparison threshold current signal based on the steady-state voltage signal and a second reference voltage. When the voltage between the output terminal of the transient circuit and the output terminal of the comparison threshold generation circuit is half of the low-voltage regulated power supply signal, the transient current signal is equal to the comparison threshold current signal, making the detected synchronization pulse signal independent of the supply voltage signal. In this way, the high accuracy of the low-level detection of the synchronization pulse signal is ensured. Compared with the prior art of high-voltage detection, the circuit structure of the present invention is simple, highly reliable, and low in cost.

The invention discloses a power supply detection circuit with an output power adjusting function, a charger and a method. The circuit comprises a current input end, a transformer, a current output end, a current detection module, a high and low voltage detection module, an MCU control module, a PWM control module and a switch chopping module. The current output end is coupled with the current input end through the transformer; the current detection module is used for detecting current output by a secondary winding of the transformer, and the high and low voltage detection module is used for detecting voltage output by the secondary winding; the MCU control module is connected with the current detection module, the high and low voltage detection module and the PWM control module, and is used for controlling PWM signal output of the PWM control module according to the voltage detected by the high and low voltage detection module and the current detected by the current detection module; the switch chopping module is connected with a primary winding of the transformer, and the PWM control module controls the on-off of the switch chopping module through a PWM signal so as to realize the function of adjusting the output power.

An embodiment of the utility model relates to a shoe lamp component which comprises a light emitting diode, a chip mainboard, a battery, a low-voltage detection circuit and a packaging shell, the chip mainboard, the battery and the low-voltage detection circuit are arranged inside the packaging shell, and the light emitting diode is arranged outside the packaging shell. The low-voltage detection circuit comprises a voltage sampling circuit, a voltage comparator and a low-voltage indication circuit, the voltage sampling circuit is connected with the battery, the voltage comparator is connected with the voltage sampling circuit, and the low-voltage indication circuit is connected with the voltage comparator; the voltage sampling circuit samples the voltage of the battery to obtain a sampling voltage; the voltage comparator compares the sampling voltage with a preset reference voltage; and the low-voltage indicating circuit indicates whether the battery is in a low-voltage state based on the comparison result. According to the shoe lamp assembly provided by the embodiment of the utility model, the overall packaging structure of the product is not changed, intelligent detection of the voltage state of the battery is realized, and the risk that the product with the battery capacity not reaching the standard flows into a production line is effectively reduced.

The utility model provides a high-voltage interlocking detection system and a vehicle, the high-voltage interlocking detection system is applied to a high-voltage interlocking loop with a low-voltage detection connector, and the high-voltage interlocking detection system comprises a voltage sampling module, a voltage comparison module and a controller; the voltage sampling module is connected with the low-voltage detection connector and is used for acquiring sampling voltage; a first input end of the voltage comparison module is connected with a reference voltage, a second input end of the voltage comparison module is connected with an output end of the voltage sampling module and is used for connecting the sampling voltage, and the voltage comparison module is used for generating a comparison signal based on the reference voltage and the sampling voltage; the controller is connected with the output end of the voltage comparison module. The controller is used for determining the working state of the low-voltage detection connector based on the comparison signal. According to the invention, the problem of low efficiency of eliminating the fault of the high-voltage interlocking system can be solved.

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 present application provides a fault detection system and a vehicle. The fault detection system includes a detection circuit, a logic gate circuit, and a first control circuit. The detection circuit includes multiple detection branches, each of which outputs a corresponding first detection signal based on the connection status of a low-voltage detection connector. The logic gate circuit receives the first detection signals from the multiple detection branches and generates a second detection signal based on the multiple first detection signals. The first control circuit determines the on / off state of a high-voltage interlock circuit based on the second detection signal. When the first control circuit determines that the on / off state of the high-voltage interlock circuit is disconnected based on the second detection signal, the first control circuit further determines the connection state of multiple low-voltage detection connectors based on the multiple first detection signals. The system can determine the on / off state of the high-voltage interlock circuit based on the second detection signal and can also accurately determine the fault location based on the first detection signal, thereby improving detection and troubleshooting efficiency and achieving high detection reliability.