877 results about "Voltage ratio" patented technology

The invention belongs to the technical field of large-depth ground-to-air electromagnetic detection, and particularly relates to a light-weight high-power ground-to-air electromagnetic detection power supply system and method and a high-power vehicle-mounted power supply. Two paths of lithium battery units connected in parallel are adopted to provide short-time high-power emission current for a transmitter; the controller is used for acquiring a detection task set by the transmitter and setting a reference voltage according to the detection task; the voltage acquisition module is used for acquiring a direct-current bus voltage and comparing the direct-current bus voltage with a reference voltage to obtain a current modulation signal; and the controller is also used for acquiring the output current of each path of lithium battery unit and outputting a control signal according to the current modulation signal to compensate the output current of each path of lithium battery unit. According to the invention, the stability of a power supply system is realized when different instantaneous high-power outputs in a detection task in a high-power ground-air electromagnetic detection system are realized. When the output voltage and the sudden increase or decrease of the load current are adjusted as required, the stable output of the power supply voltage is realized.

The invention discloses an intelligent silicon controlled rectifier voltage conversion circuit, which relates to the technical field of voltage conversion, and comprises a photovoltaic module, a micro-control module, a power regulation module, a first voltage threshold, a second voltage threshold, a second voltage threshold, a third voltage threshold, a fourth voltage threshold, a fifth voltage threshold and a sixth voltage threshold, when the converted electric energy is larger than a first voltage threshold value, the access control module transmits the electric energy output by power regulation, superposes the electric energy output by double-path electric energy coupling and stores the superposed electric energy by the energy storage module, and when the converted electric energy is smaller than the first voltage threshold value and larger than a second voltage threshold value, the access control module outputs the superposed electric energy. And when the voltage is smaller than a second voltage threshold value, electric energy coupling is stopped, the power regulation module is controlled to carry out power regulation on the electric energy released by the energy storage module, and power is supplied to the output module. According to the intelligent silicon controlled voltage conversion circuit, the utilization rate of photovoltaic electric energy can be improved, and the voltage gain and the power supply efficiency are improved.

Disclosed in the present invention are a current lookup table-based permanent magnet synchronous motor wide voltage range control method and a medium. The method comprises: by means of a full-speed domain current calibration method, obtaining a rotating speed-torque two-dimensional lookup table under a rated bus voltage; on the basis of the lookup table, multiplying a given rotating speed with a front-and-rear amplitude limiting voltage ratio to achieve wide voltage range control; and performing friction torque compensation and sampling delay compensation of a three-phase current at different rotating speeds. The present invention takes into account bus voltage fluctuation under the complex working condition of an electric vehicle, and multiplies the given rotating speed with a variable voltage coefficient ku to obtain an input rotating speed of an input current lookup table, such that precise current control of the permanent magnet synchronous motor under different bus voltage working conditions can be achieved, thereby avoiding the complex and tedious process of re-calibration of the current lookup table under different bus voltages; the present invention also takes into account friction torque compensation and phase current sampling delay compensation at different rotating speeds, wherein the friction torque compensation can be achieved by directly adding a friction torque error into a given torque signal in real time.

The disclosure relates to an electronic circuit to verify the integrity of a switch. The circuit comprises a voltage comparator and decoupling switch. The decoupling switch configured receive the driving signal having a first logic value to enable the monitoring of the comparison voltage and is configured to receive the monitoring enable signal having a first logic value to command the opening of the decoupling switch. The electronic circuit is configured to generate the output monitoring signal having a first logic value in an event that the switch is an open circuit and having a second logic value in an event that the switch is a short circuit.

The invention relates to a CVT error evaluation method and device, error evaluation equipment and a storage medium, and belongs to the technical field of mutual inductor error recognized.The CVT error evaluation method comprises the steps that a first data set is restored to a primary voltage level based on voltage proportionality coefficients of multiple CVTs to obtain a second data set, and a difference matrix is constructed based on the second data set; establishing a likelihood function based on the difference matrix, and converting the likelihood function into a posterior probability density function based on a Bayesian formula; extracting data corresponding to a preset number of CVTs from the second data set to construct a third data set, and determining a prior probability density based on the third data set; and based on a multi-chain MCMC algorithm fused with plant rhizome growth and a posterior probability density function, determining error values corresponding to a plurality of CVTs when the posterior probability density is maximum. According to the method, the accuracy of CVT error evaluation is effectively ensured, and meanwhile, the error evaluation efficiency is also improved.

The invention provides a voltage-controlled oscillator and a phase-locked loop circuit, and relates to the technical field of integrated circuits. The voltage-controlled oscillator comprises a voltage-controlled circuit, a current copying circuit and an oscillating circuit, the voltage control circuit comprises a comparison unit, a switch unit and a voltage acquisition unit. A first input end of the comparison unit is used for receiving input control voltage, a second input end of the comparison unit is grounded through the voltage acquisition unit, an output end of the comparison unit is connected with a control end of the switch unit, one end of the switch unit is grounded through the voltage acquisition unit, and the other end of the switch unit is connected with an input end of the current copying circuit; the output end of the current copying circuit is connected with the input end of the oscillation circuit, and the output end of the oscillation circuit is used for outputting a control signal with target oscillation frequency. According to the voltage-controlled oscillator, the linearity of voltage control current is optimized, and meanwhile, the working voltage range of the voltage-controlled oscillator is expanded.

The invention relates to the technical field of electric power measurement online monitoring. The invention discloses a CVT error calculation method and device based on a virtual standard algorithm and a storage medium, and the method comprises the steps: collecting the voltage original waveform data of a plurality of CVTs in a homologous state in real time, and calculating the amplitude and phase of the data; constructing a steady-state data set; calculating an initial virtual standard; calculating an initial voltage ratio difference value and an initial voltage angle difference value; inverting a real-time virtual standard; calculating an overall virtual standard; calculating an instantaneous voltage ratio difference value and an instantaneous voltage angle difference value; and outputting a CVT state judgment result. According to the method, the accuracy of CVT error calculation is effectively improved, the state of the mutual inductor can be more accurately judged, and a powerful guarantee is provided for stable operation of a power system.

The invention discloses an inverter turn-off protection circuit, which comprises a bus voltage sampling circuit, a current sampling module, a multiplier, a threshold voltage comparison circuit and a gate turn-off circuit, and is characterized in that the bus voltage sampling circuit is used for sampling an inverter bus voltage to obtain a sampling voltage; the current sampling module is used for sampling phase current output by the alternating current side of the inverter to obtain sampling current; the multiplier is used for receiving the sampling voltage and the sampling current and carrying out multiplication operation to obtain instantaneous power; the threshold voltage comparison circuit is used for comparing the instantaneous power with a threshold to obtain a level signal; and the gate pole turn-off circuit is used for controlling the turn-off of a gate pole turn-off switch tube according to the level signal output by the threshold voltage comparison circuit so as to control the turn-off of a power tube of the inverter. The inverter turn-off protection circuit operates independently, is not affected by an MCU system, is low in cost and high in response speed, and greatly improves function safety.

The invention discloses a fault detector of an accelerator switch assembly and a detection method thereof. The fault detector comprises at least one detection circuit. Each detection circuit comprises three constant current sources with equal output current, a first resistor and two voltage comparators; the input ends of the three constant current sources are used for inputting reference current; the output end of the first constant current source and the output end of the second constant current source are used for being connected with a normally-closed contact and a normally-open contact of an electric switch to be tested respectively, and the output end of the third constant current source is grounded through a first resistor. The common contact of the to-be-tested switch is grounded. Two input ends of the first voltage comparator are respectively connected with the output end of the first constant current source and the output end of the third constant current source; two input ends of the second voltage comparator are respectively connected with the output end of the second constant current source and the output end of the third constant current source; the output ends of the first voltage comparator and the second voltage comparator are used for outputting detection signals. According to the scheme, the detection efficiency and the detection precision of fault detection of the accelerator switch assembly can be greatly improved.

The invention provides an output negative voltage protection circuit applied to an N-type power device linear voltage regulator. The output negative voltage protection circuit comprises a voltage comparator, a current comparator, an error amplifier, a buffer driver, a power device MP, a resistor R1, a resistor R2, a resistor Rload and a capacitor Cout. The method comprises the following steps: acquiring a voltage difference between an S-pole output voltage Vout of a power device MP and a reference voltage Vos through a voltage comparator, converting the voltage difference into a current signal Ieg, and comparing the current signal Ieg with a reference current Ios through a current comparator to generate a current signal Ilim; adjusting the output of an error amplifier according to the current signal Ilim, and dynamically adjusting the G pole voltage Vgate of the power device MP; when the output voltage Vout is lower than the reference voltage Vos, the G pole voltage Vgate is pulled down to turn off the power device MP through the current signal Ilim, and protection of the power device MP is achieved.

The utility model provides a protection circuit and a vehicle power utilization system, and relates to the technical field of electronic circuits. The protection circuit comprises a voltage clamping unit, a voltage comparison unit and a first switch unit, wherein one end of the voltage clamping unit is connected with a power supply input end, the other end of the voltage clamping unit is connected with a first input end of the voltage comparison unit, and the voltage clamping unit is used for clamping the voltage of the power supply input end to a first voltage and outputting the first voltage to the voltage comparison unit; the second input end of the voltage comparison unit is connected with a preset voltage reference point, the output end of the voltage comparison unit is connected with the control end of the first switch unit, and the voltage comparison unit is used for turning off the first switch unit when the first voltage is larger than the voltage input by the preset voltage reference point; the first end of the first switch unit is connected with the power input end, and the second end of the first switch unit is connected with the voltage output end. Therefore, when a load throwing event occurs, high voltage is clamped, overvoltage protection is realized, and damage to electric equipment is avoided.

The invention discloses a CAN bus activity detection and wake-up circuit and method, and belongs to the technical field of CAN bus communication, the CAN bus activity detection and wake-up circuit comprises a CAN bus interface circuit, a signal detection and processing circuit and a controller, the input end of the CAN bus interface circuit is connected with a CAN bus; the signal detecting and processing circuit comprises a voltage comparator, the non-inverting input end and the inverting input end of the voltage comparator respectively receive a CANH signal and a CANL signal which are electrically isolated by the CAN bus interface circuit, and the output end of the voltage comparator is connected to a wake-up pin of the controller; the controller is used for monitoring the level state of the wake-up pin, and when the level of the wake-up pin is in an effective state, the electronic equipment is controlled to be switched from the sleep mode to the normal working mode. By introducing an electrical isolation and voltage difference detection mechanism, the problem of false wake-up caused by common-mode interference or bus noise in the prior art is solved, and reliable wake-up under low power consumption is realized.

The present disclosure is an open-loop digital PWM envelope tracking system with dynamic boost function. Systems, apparatuses, and methods are described for dynamically boosting (increasing) the supply voltage of an envelope tracking (ET) modulator in a transmitter system when the target / desired PA supply voltage exceeds a pre-determined threshold (e.g., the pre-determined threshold is equal to the available supply voltage of the system, such as the battery voltage). By boosting the supply voltage input to the ET modulator, the modulated supply provided to the power amplifier (PA) is also increased. As such, voltage clipping, which typically occurs when the target / desired PA supply voltage is higher than the available supply voltage, is mitigated or avoided, and the distortion of the transmitted signal is reduced.

A control circuit for a switching converter has a valley current limiting circuit, a peak current limiting circuit, an ON time control circuit, and a switching control circuit. The valley current limiting circuit provides a valley current comparison signal by comparing a current sense signal with a first current threshold. The current sense signal is representative of a current flowing through a switching circuit of the switching converter. The peak current limiting circuit provides a peak current comparison signal based on the valley current comparison signal, a switching control signal, and a second current threshold. The ON time control circuit provides an ON time control signal based on the switching control signal. The switching control circuit provides the switching control signal based on the voltage comparison signal, the valley current comparison signal, the peak current comparison signal, and the ON time control signal to control the switching circuit.

The invention provides an intrinsically safe PFC line output control circuit, a charging device and a system.The intrinsically safe PFC line output control circuit is provided with a BUCK unit, an output sampling unit, a reference voltage setting unit, a voltage comparison unit and a PWM control unit, the BUCK unit is connected with a preceding-stage PFC circuit, the output sampling unit and the PWM control unit, an output sampling voltage is obtained by outputting a sampling current, and in addition, the voltage comparison unit is connected with the PWM control unit. The output sampling unit and the reference voltage setting unit are connected with the voltage comparison unit, output sampling voltage is compared with reference voltage, a first control signal is output according to a comparison result, then the voltage comparison unit is connected with the PWM control unit, the first control signal is sent to the PWM control unit, the PWM control unit outputs a second control signal, and the PWM control unit outputs the second control signal. Therefore, the conduction state of the BUCK unit is controlled through the second control signal, the output current of the BUCK unit can be intelligently reduced when the output current corresponding to the pre-stage PFC circuit is greater than the maximum output current or the power supply circuit is short-circuited, under-voltage and over-power, and the power supply safety is ensured.

The invention discloses an AC / DC power distribution network protection method and device based on a negative sequence voltage ratio. The method comprises the following steps: constructing a fault identification criterion of a two-phase interphase short-circuit fault of the AC / DC power distribution network according to negative sequence voltage fault characteristics of internal and external faults of the AC / DC power distribution network; determining the fault type of the protection line according to the negative sequence current at the head end measuring point of the AC / DC power distribution network protection line and a pre-constructed fault type identification criterion; when the fault type is a three-phase fault, an overcurrent protection method is adopted to protect the protection line; and when the fault type is a two-phase interphase short-circuit fault, determining an internal and external fault identification result of the protection line according to the negative sequence voltage of the measuring points at the two ends of the protection line, the negative sequence comparison voltage and a fault identification criterion.

The invention discloses a circuit breaker intelligent comprehensive detector and a detection method in the technical field of circuit breaker intelligent comprehensive detectors. The circuit breaker intelligent comprehensive detector comprises a central unit control / acquisition module, an AC voltage / current output module, an excitation signal module, a contact signal module, an insulation test module and a circuit breaker test module. The central unit control / acquisition module is respectively connected with other modules and is used for distributing instructions to each module, acquiring and conditioning test data signals and evaluating the comprehensive state of the circuit breaker; the alternating voltage / current output module is used for applying excitation to a coil of the voltage comparison relay or the current comparison relay; the excitation signal module is used for applying excitation to the relay coil and the circuit breaker coil; the contact signal module is used for testing the performance of a relay contact; the insulation test module is used for carrying out an insulation test on a secondary circuit of the circuit breaker; the circuit breaker test module is used for testing mechanical characteristics of the circuit breaker.

The invention provides a charge pump control circuit, a chip and electronic equipment, and relates to the technical field of power management chips, and the circuit comprises a voltage division circuit, a reference voltage generation circuit, a comparison circuit and a charge pump circuit. The voltage division circuit comprises an input end, a first control end and a second control end, the input end is used for accessing auxiliary voltage, the first control end is used for accessing charge pump voltage, and the second control end is used for accessing power supply voltage; the voltage division circuit generates divided voltage; the reference voltage generation circuit generates a first reference voltage and a second reference voltage. The comparison circuit compares the divided voltage with the first reference voltage and the second reference voltage to obtain corresponding control signals; the charge pump circuit boosts based on the power supply voltage according to the control signal to obtain a charge pump voltage. The current required by the voltage division circuit is provided through the auxiliary voltage, and the charge pump voltage is only used for providing the control voltage signal of the voltage division circuit, so that the current load of the charge pump voltage is reduced, and the power consumption is reduced.

The invention discloses a tunnel reluctance current sensor self-correction measurement method, system and device based on voltage feedback and a medium, and belongs to the technical field of current measurement and sensor anti-interference, and the method comprises the steps: extracting fundamental wave complex components at the fundamental wave frequency of a power supply voltage and an initial output voltage; calculating a filter coefficient according to the fundamental wave complex component and performing phase correction on the output voltage to obtain a corrected output voltage sequence aligned with the phase of the power supply voltage signal; calculating a voltage ratio signal according to the corrected output voltage and the power supply voltage and determining a ratio signal residual error; final current estimation is obtained according to the voltage ratio signal and the ratio signal residual error in combination with the ratio signal; according to the invention, a double-closed-loop compensation structure is adopted, so that channel mismatching and non-linear interference are effectively suppressed; the digital implementation mode enables the system to have good reconfigurability and environmental adaptability, and the system is suitable for application scenes such as intelligent power grids, distributed power monitoring and industrial online detection.

An input is coupled to a cathode of a laser diode having its anode coupled to a high-voltage-supply, with a cascoded current mirror having an input and output branches. The input branch is coupled between the high-voltage-supply and a sense resistor coupled to the input. The output branch is coupled between the high-voltage-supply and an output. A sense resistance is coupled between the output and ground, and includes a diode-coupled transistor coupled to the output and a resistor coupled between the diode-coupled transistor and ground. The input branch generates a current proportional to a voltage across the laser diode, and the output branch generates a mirrored current proportional to the current proportional to the voltage across the laser diode. A voltage proportional to the voltage across the laser diode is generated by the mirrored current flowing through the sense resistance. A comparison circuit compares this voltage to a threshold.

The utility model discloses a DC power supply input protection circuit. The transient absorption circuit is used for absorbing transient voltage spike pulse generated by input voltage of the power supply; the voltage stabilizing circuit is used for generating stable voltage when the power supply is input in a wide voltage range; the second voltage division circuit and the power supply output control switch circuit are connected in parallel and are arranged between the power supply input end and the power supply output end of the direct-current power supply, and the first voltage division circuit can divide the stable voltage generated by the voltage stabilizing circuit; the first voltage division circuit is connected with the in-phase end of the comparator to provide reference voltage for the comparator, the second voltage division circuit is connected with the anti-phase end of the comparator to provide input voltage for the comparator, and the comparator can compare the reference voltage with an input voltage signal. When the input voltage is higher than the reference voltage, the output end of the comparator outputs a signal for controlling the switching circuit to close to the power supply. The overvoltage protection circuit is sufficient and accurate in overvoltage protection, can be applied to a relatively wide voltage range, and is low in cost.

The invention provides a light load control method, an LLC resonant converter using the same and a storage medium, the method is based on a double closed-loop control structure of a voltage outer loop and a current inner loop, different load conditions are adapted by automatically switching a PFM mode, a PWM mode and a BURST mode, and the method comprises the following steps: setting control parameters; sampling an output voltage Vout and an output current Iout of the LLC resonant circuit; inputting a voltage error obtained by comparing a preset reference voltage Vref with the output voltage Vout into a PI controller of a voltage outer loop, and calculating to obtain a reference current Iref; a current error obtained by comparing the reference current Iref output by the voltage outer loop with the output current Iout is input into a PI controller of the current inner loop; and judging the working mode of the current control period according to the duty ratio Duty of the previous control period and the frequency demand f output by the current inner loop. According to the invention, through combination of double closed-loop control and three-mode intelligent switching, comprehensive optimization of efficiency, dynamic response and output voltage quality in a full-load range is realized.

The present invention discloses a small power-off delay circuit, comprising: a voltage conversion circuit unit, an energy storage circuit, a voltage comparison unit, and a delay control unit. A transformer is used to reduce the voltage of high-voltage alternating current and isolate electromagnetic interference, and then a rectifier and filter circuit is used to convert the low-voltage alternating current into low-voltage direct current for subsequent power supply to the circuit. The circuit not only has a power-off delay function for inputting a wide voltage range of 20V to 400V AC, but also solves the problems of lack of electromagnetic interference isolation for the input signal and the large size and high heat generation of the rectifier and filter circuits. The functions of electromagnetic interference isolation of the input signal and circuit miniaturization are achieved. The difficulty of matching the circuit parameter design with the actual transformer conditions is overcome.

The invention discloses an overvoltage protection circuit and method. The circuit comprises a sampling circuit, a current mirror circuit, a charging circuit and a comparator circuit, the sampling circuit is used for sampling the voltage of the voltage detection end to obtain a sampled voltage; the current mirror circuit is used for scaling down the sampling voltage and charging the charging circuit; and the comparator circuit is used for detecting the voltage of the charging circuit and sending an overvoltage protection signal when determining that the charging voltage is greater than a preset overvoltage protection threshold value. According to the overvoltage protection circuit, the current flowing through the first capacitor is scaled down through the current mirror by the current mirror circuit, then the second capacitor is charged by the scaled-down current, and when the voltage on the capacitor reaches the threshold value, overvoltage protection is triggered. The voltage sampling network is a capacitor and has no static power consumption. And the capacitor can be integrated into the chip, so that the system integration level can be effectively improved.

A switching regulator includes: a switching circuit that switches an input voltage based on a gate control signal, and outputs a switching voltage; a voltage difference detector that compares the switching voltage with a threshold value depending on the input voltage, and outputs a comparison result signal; and a control circuit that generates a gate control signal based on an output voltage to which the switching voltage is fed back after smoothed and the comparison result signal, and outputs the gate control signal to the switching circuit. The voltage difference detector includes: an integration circuit that generates a pseudo-output voltage obtained by integrating the switching voltage on time and substantially equal to the output voltage; and a comparator circuit that compares the pseudo-output voltage with a threshold value depending on a power supply voltage, and outputs the comparison result signal.

The embodiment of the invention provides a full-period inductive current sampling circuit, a voltage converter, a chip and electronic equipment, and the sampling circuit comprises an amplification circuit, a negative feedback control circuit, a biasing circuit, a first switch control circuit, a second switch control circuit, and a sampling compensation circuit. The amplifying circuit is used for comparing the drain electrode voltage of the lower power tube with the drain electrode voltage of the lower sampling tube, or comparing the source electrode voltage of the upper power tube with the source electrode voltage of the upper sampling tube and then outputting comparison voltage; the negative feedback control circuit is used for adjusting the input voltage of the amplifying circuit according to the comparison voltage and outputting inductance sampling current; the biasing circuit is used for providing current bias for the amplifying circuit; the first switch control circuit and the second switch control circuit are used for controlling the amplifying circuit to select different input ends; and the sampling compensation circuit is used for compensating the inductance sampling current during the sampling period of the upper tube. The problems of large power loss and low conversion efficiency of an existing inductive current full-period sampling mode are solved.

The invention relates to an under-voltage protection circuit and electronic equipment. The under-voltage protection circuit comprises an energy storage circuit, a comparison circuit and a bleeder circuit. The energy storage circuit is used for accessing power supply voltage. A first input end of the comparison circuit is connected with the energy storage circuit, and a second input end is connected with power supply voltage; the control end of the bleeder circuit is connected with the output end of the comparison circuit, the input end of the bleeder circuit is connected with voltage to be discharged, and the output end of the bleeder circuit is grounded. When the power supply voltage is greater than or equal to a preset under-voltage threshold value, the energy storage circuit is charged, and the comparison circuit outputs a first level signal; under the condition that the power supply voltage is smaller than the preset under-voltage threshold value, the energy storage circuit discharges, and the comparison circuit outputs a second level signal; the bleeder circuit bleeds the voltage to be discharged according to the second level signal and stops discharging according to the first level signal. When the power supply voltage drops suddenly, the bleeder circuit can rapidly discharge the to-be-discharged voltage, thereby reducing the damage risk of the internal module of the PMIC caused by abnormal power failure, and improving the use reliability of the PMIC.

The invention belongs to the field of photovoltaic grid-connected power generation, and discloses a photovoltaic grid-connected intelligent circuit breaker and a working method thereof, and the circuit breaker integrates a voltage comparison module, a state judgment module and a delay control module to form the photovoltaic grid-connected circuit breaker with intelligent monitoring and decision-making capabilities. The voltage comparison module collects a power grid voltage signal in real time and carries out threshold comparison; the state judgment module classifies the voltage state into normal, overvoltage or undervoltage according to the comparison result, and generates a corresponding level signal; the delay control module starts timing logic after receiving the level signal, and triggers the execution module to control the circuit breaker to act only after the voltage abnormal state lasts for a certain time. According to the circuit breaker, the problem of terminal overvoltage caused by distributed photovoltaic access can be actively suppressed, the line loss of a power grid is reduced, and the voltage stability is improved; false triggering can be prevented through a delay action mechanism, and power supply continuity and electric energy quality are guaranteed; the dependence on manual inspection can be reduced, the operation and maintenance efficiency is remarkably improved, and the operation cost is reduced.

The present invention discloses an isolation feedback circuit for detecting the output state of an optocoupler, which is applied to an optocoupler module connected to a load. The circuit includes a main control module, an isolation feedback module, a current detection module, a current upper limit comparison module, a current lower limit comparison module, a voltage detection module, and a voltage comparison module; the optocoupler module is also connected to the main control module and the current detection module respectively; the current detection module is connected to the current upper limit comparison module and the current lower limit comparison module respectively; the voltage detection module is connected in parallel with the load, and the voltage detection module is connected to the voltage comparison module; the current upper limit comparison module, the current lower limit comparison module, and the voltage comparison module are all connected to the isolation feedback module; the isolation feedback module is connected to the main control module. The present invention can clearly know the output state of the output end of the optocoupler module in real time, so as to timely learn about the abnormality of the output end of the optocoupler module, thereby reducing the impact on the normal output of the signal and avoiding safety problems.

The invention belongs to the field of electronic circuits, and provides a level conversion circuit, a switching power supply chip and electronic equipment. The circuit comprises a voltage output module, a logic module and a comparison module. First ends of the voltage output module and the logic module receive output voltage. The second end of the voltage output module is connected with the second end of the logic module and the first end of the comparison module. The second end of the comparison module receives reference voltage, and the third end is connected with the third end of the logic module; the fourth end of the logic module outputs target voltage, and the fifth end and the third end of the voltage output module are both grounded. In the starting process of the boost switching power supply chip, when the output voltage is smaller than a preset value, the voltage output module outputs a first voltage. The comparison module outputs a first comparison signal according to the first voltage and a reference voltage. The logic module enables the fourth end and the fifth end of the logic module to be conducted according to the first comparison signal, the target voltage is made to be 0V, then the voltage margin is the output voltage, and compared with an existing circuit, the voltage margin is increased.