1138 results about "Dividing circuits" patented technology

The utility model relates to the technical field of backlight power supplies, aims to solve the technical problems of large misoperation and poor stability of a backlight circuit, and discloses a backlight control circuit, which comprises a voltage reduction module U12 for reducing the voltage of a power supply VCC1 into a power supply VCC2, a backlight controller U10 and an enable circuit, and the enable circuit comprises a triode Q14 and a triode Q12. The output end of the voltage reduction module U12 is connected with the enabling end of the backlight controller U10 through a resistor R68, the overvoltage protection circuit comprises an NMOS tube Q11, the source electrode of the NMOS tube Q11 is grounded, the drain electrode of the NMOS tube Q11 is connected with the enabling end of the backlight controller U10, the grid electrode of the NMOS tube Q11 is connected with a first series voltage division circuit, the triode Q12 indirectly controls power supply of the voltage reduction module U12 by controlling the on-off state of the triode Q14, and the voltage reduction module U12 indirectly controls the power supply of the backlight controller U10. An NMOS tube Q11 and a first series voltage division circuit in the overvoltage protection circuit are used for monitoring the voltage of a power supply VCC1 in real time. When the voltage is too high, the NMOS tube Q11 is switched on, the enabling end voltage is directly lowered, and work is stopped, so that overvoltage protection is achieved.

The railway safety equipment comprises a redundant power supply circuit, a power distributor, a controller and a main circuit, the output end of the power distributor is connected to the controller and the main circuit, and the input end of the power distributor is connected to the redundant power supply circuit; the redundant power supply circuit comprises a power output terminal, a first gated field effect transistor, a pull-down resistor, a first P-channel field effect transistor, a second P-channel field effect transistor, a third P-channel field effect transistor and a voltage division circuit, and a second diode is connected in parallel between the drain electrode and the source electrode of the second P-channel field effect transistor. And the positive electrode of the second diode is connected with the drain electrode of the second P-channel field effect transistor. Compared with the prior art, the invention can prevent reverse flow into the main power supply interface to break down other electric equipment when the standby power supply supplies power, and can improve the switching speed while quickly cutting off the standby circuit after the main power supply is conducted.

The invention discloses a high-precision alternating-current voltage direct-current component detection circuit which comprises a capacitance-resistance voltage division circuit, a differential amplification circuit, a second-order RC filter circuit, a voltage following and lifting circuit and an AD voltage clamping circuit which are arranged in sequence. The invention aims to improve the detection precision of the direct-current voltage in the alternating-current output voltage of the energy storage converter and feed back the detected accurate direct-current voltage amplitude to the CPU to carry out closed-loop control on the system output voltage so as to achieve the purpose of reducing the direct-current component in the alternating-current output voltage of the energy storage converter.

The invention discloses a port bandwidth allocation circuit and method for PCIe equipment, the circuit comprises at least one CPU and a plurality of corresponding ports, the ports are inserted into the PCIe equipment through a socket circuit, the port bandwidth allocation circuit further comprises connectors connected with the ports, when the socket circuit of each port is inserted into the first PCIe equipment or the second PCIe equipment, different levels are output at the in-place detection end, and when the first PCIe equipment or the second PCIe equipment is inserted into the second PCIe equipment, different levels are output at the in-place detection end. When the second PCIe equipment with different bandwidth allocation modes is inserted, different voltage division circuits are formed, and the equipment detection signal end outputs different level voltages; the connector is used for detecting an in-place detection signal and an equipment detection signal and sending the signals to the CPU; and the CPU allocates the port bandwidth of the PCIe equipment according to the in-place detection signal and the equipment detection signal of each port. Therefore, the problem that IO resources are wasted by adopting dynamic bandwidth allocation or a fixed bandwidth allocation mode is not flexible in the prior art is solved.

The present application discloses a switch control circuit and a backlight driver board. The switch control circuit includes a voltage dividing circuit, a first transistor, and a second transistor. The voltage dividing circuit includes an input end and an output end, and the input end receives a control signal. A control electrode of the first transistor is connected with the output end, and an input electrode of the first transistor receives a power supply voltage. A control electrode of the second transistor is connected with an output electrode of the first transistor, an input electrode of the second transistor receives an input voltage, and an output electrode of the second transistor is connected with a voltage output end.

The invention discloses a conversion circuit for measuring time sequence arc delay of a standard unit, which belongs to the field of integrated circuits and comprises a time sequence arc delay clock generation circuit of the standard unit, a clock frequency dividing circuit, a control module and an IO output module. The standard unit time sequence arc delay clock generation circuit connects a plurality of same standard units in series to form a test chain, delays the time sequence arc of a single standard unit, and outputs the time sequence arc in a stable-frequency clock form; the clock frequency division circuit performs frequency division on the stable clock generated by the standard unit time sequence arc delay clock generation circuit through an algorithm, so that the stable clock can be detected by a machine table; the control module selects a plurality of standard cell types from the control signal, selects a time sequence arc, selects a cascade stage number, and controls the output of the clock frequency dividing circuit; and the IO output module outputs the frequency-divided clock generated on the chip through an IO port so as to be detected by a machine. According to the invention, extra power consumption, area and design complexity caused by an extra on-chip high-frequency clock can be effectively avoided.

The invention relates to the technical field of mobile communication antennas, and provides a phase shifter assembly and a base station antennae, and the phase shifter assembly can comprise a metal housing, a power division circuit board, a metal wire, a plastic connection block, a phase shift medium block, and a first guide projection and a first guide groove which are matched with each other. The metal shell comprises a first packaging wall, a second packaging wall, a connecting wall, a top wall, a first opening and a second opening, and the power division circuit board covers the second opening; the metal wire is fixed with the metal shell through the plastic connecting block; the phase shifting medium block can penetrate through the first opening and can slide back and forth in the direction from the first opening to the connecting wall; one of the first guide protrusion and the first guide groove is arranged on the first packaging wall and extends towards the connecting wall along the first opening, and the other one is arranged on the surface, opposite to the first packaging wall, of the phase shifting medium block. According to the phase shifter assembly provided by the embodiment of the invention, the performance stability can be improved.

The invention relates to an electromagnetic valve fault diagnosis technology, and discloses an automobile intelligent chassis electric control system and a control circuit thereof, the automobile intelligent chassis electric control system comprises a first fault diagnosis circuit and a second fault diagnosis circuit, the first fault diagnosis circuit and the second fault diagnosis circuit respectively comprise a voltage collector, a voltage division circuit and a protection circuit; the protection circuit is used for protecting the fault diagnosis circuit, the voltage division circuit is used for dividing the voltage output by the electromagnetic valve, and the voltage collector is used for collecting the divided voltage; the voltage collector is used for collecting the voltage of the electromagnetic valve in real time; and determining the state of the electromagnetic valve according to the acquired voltage of the electromagnetic valve. Fault diagnosis of the electromagnetic valves of the intelligent chassis electric control system of the automobile can be carried out without driving the electromagnetic valves, only one port resource is needed for diagnosis of each electromagnetic valve, the diagnosis mode is simple, and the cost is low.

The invention discloses a wide-range impulse current measurement method and device, and belongs to the technical field of impulse current measurement, and the method comprises the steps: obtaining first-grade A / D sampling data, second-grade A / D sampling data and third-grade A / D sampling data generated when a lightning arrester bears an impulse current; comparing the A / D maximum sampling value in each grade of A / D sampling data with the A / D maximum sampling value corresponding to the zero potential, and judging whether the corresponding impact current is positive or negative; screening out the optimal grade of A / D sampling data according to the A / D maximum sampling value in each grade of A / D sampling data and the positive and negative of the corresponding impact current; obtaining circuit data of each voltage division circuit and performance data of the mutual inductor, and calculating an impact current peak value based on the optimal grade A / D sampling data, the circuit data of the corresponding voltage division circuit and the performance data of the mutual inductor; according to the invention, the measuring range of each gear is reduced through step-by-step measurement, so that the accurate measurement of the wide-range impulse current is realized.

The invention discloses an electrostatic protection circuit and method, equipment and a storage medium, and relates to the technical field of electrostatic protection, and the circuit comprises a metal sheet connecting plug, an electrostatic discharge circuit, an electrostatic sampling circuit and a microcontroller; the metal sheet connecting plug is electrically connected with the metal sheet, the electrostatic discharge circuit and the electrostatic sampling circuit respectively; the electrostatic sampling circuit comprises a voltage division circuit and a conditioning circuit, and the voltage division circuit is electrically connected with the metal sheet connecting plug and the conditioning circuit; and the microcontroller is in communication connection with the electrostatic sampling circuit and the electrostatic discharge circuit and is used for performing analog-to-digital conversion on the output voltage of the conditioning circuit to obtain electrostatic voltage and controlling the electrostatic discharge circuit to be switched on or switched off. The static voltage of the operator can be acquired in real time through the microcontroller so as to accurately judge whether the static discharge of the current operator is in place or not, so that the condition of hot-line operation of corresponding equipment when the static discharge is insufficient is reduced, and the accuracy and reliability of the static discharge are improved.

Provided is a direct current voltage sampling circuit used for a medium-voltage power module. The medium-voltage power module includes two cascaded H-bridge circuits. The sampling circuit includes two sampling sub-circuits, with each connected to one H-bridge circuit. The sampling sub-circuit includes: a voltage dividing circuit connected in parallel to an output end of the H-bridge circuit, an isolation module connected to the voltage dividing circuit, a direct current isolated power supply which supplies power to the isolation module independently of the H-bridge circuit, and an amplifier conditioning module which converts an isolated voltage signal into a sampled voltage output. Parasitic capacitances of the isolation module and the direct current isolated power supply are both less than 2 pF, and the sampled voltage outputs of the two sampling sub-circuits are provided to a same local controller. The sampling circuit can suppress the impact of circulation components between two direct current buses in double cascaded bridges, making sampling results more accurate.

The invention discloses an optical Gray code encoder temperature compensation method and system based on an NTC resistance network, and the method comprises the steps: calibrating a PD signal drift law in a working temperature range, designing an NTC voltage division circuit matched with the law, and integrating the NTC voltage division circuit to a comparator, thereby achieving the real-time offset of the PD signal temperature drift. According to the scheme, the defects that in the prior art, complexity is high and cost is high are overcome, compensation precision within + / -0.5% is achieved only through basic electronic elements, the response speed reaches the microsecond level, cost is reduced by 60% or above, the method is suitable for wide-temperature-range scenes ranging from-40 DEG C to 85 DEG C, and a low-cost and high-precision temperature compensation solution is provided for precise measurement of high-end equipment.

The present disclosure discloses an electrical discharge circuit. A voltage-dividing circuit performs voltage division on a voltage input terminal. A detection circuit generates a boosted detection signal. A first inverter is coupled to a first voltage feeding terminal and a second inverter input terminal. A second inverter is coupled to a first inverter output terminal and a ground terminal. A capacitor circuit of a RC circuit is coupled to the first voltage feeding terminal through a resistor to be charged to provide electric charges to the inverter input terminals. A first switch circuit is coupled to one of the inverter input terminals and the ground terminal. The boosted detection signal turns on and off the first and the second switch circuits respectively when an ESD input occurs such that a first and a second discharge transistors controlled by the inverter output terminals turn on to discharge the voltage input terminal.

The invention provides an efficient solar water heater, and belongs to the technical field of solar water heaters. Comprising a support, and a base is fixed to the support and used for stably supporting the whole device. The reflecting plate is connected with a heat preservation water tank, the heat preservation water tank is installed on the top of the base, the reflecting plate is installed around the base and can rotate around the base, a vacuum heat collection pipe and a photoresistor are arranged on the side, facing the sun, of the reflecting plate, and the photoresistor is used for detecting the illumination intensity change and is connected with a fixed resistor in series. The voltage division circuit is connected to the two ends of a power supply and is used for generating different partial voltages according to the change of the resistance value of the photoresistor; the microcontroller is connected with the voltage division circuit and is used for detecting the change of the voltage at the two ends of the photoresistor in the voltage division circuit and judging whether the voltage exceeds a set threshold value or not; and the motor driver is connected with the microcontroller. According to the invention, the overall working efficiency can be improved by accurately tracking the sun.

The invention discloses a broadband low-power-consumption receiving and transmitting shared phase shifter which comprises a differential signal common port, a frequency sampling and control circuit, a dual-mode orthogonal generation circuit and a passive vector modulation synthesis circuit. The differential signal common port comprises a common input / output port interface of RF + and RF-differential radio frequency signals; the frequency sampling and control circuit is composed of a frequency sampling circuit, a frequency detection circuit and a logic control unit. The dual-mode orthogonal generation circuit is composed of a frequency selection change-over switch, a multi-phase filter, a coupling transformer, a matching network 1 and a matching network 2. The passive vector modulation synthesis circuit is composed of two passive vector modulation arrays and two combining / power dividing circuits.

The invention discloses a fault positioning system of a photovoltaic power station, and relates to the technical field of integrated circuits, and the fault positioning system of the photovoltaic power station comprises a starting power supply VCC1, a detection power supply VCC2, resistors R0 and R7, a plurality of first automatic voltage division circuits, a plurality of multiplexers U, a plurality of traversal circuit units, a panel sensor, a support sensor and a short circuit positioning circuit. According to the method, the resistance value and the delay time of each detection node are collected, so that the loosening state of the screws of the photovoltaic module is accurately judged, the loosened photovoltaic module is positioned through the resistance value change, the number of the loosened screws in the photovoltaic module is obtained through the delay time change, and meanwhile, the number of the loosened screws in the photovoltaic module is calculated through a method of combining the MOS tube and the multiplexer. The topological design has the advantages of being simple in structure, convenient to operate, high in detection efficiency and the like, and is suitable for screw looseness detection of equipment such as a photovoltaic module and the like.

The invention discloses an electronic device and a voltage leakage circuit, the electronic device comprises a control circuit and a power circuit, the control circuit is connected with the power circuit and is used for controlling the power circuit to perform leakage or stop leakage, and the control circuit comprises a voltage division circuit; the comparison circuit is connected with the voltage division circuit and is used for receiving the first voltage from the voltage division circuit and comparing the first voltage with a preset reference voltage; the driving circuit receives the first reference voltage, is connected with the comparison circuit and the power circuit, and is used for outputting the first reference voltage to the power circuit when the first voltage is greater than or equal to the reference voltage so as to control the power circuit to discharge; one end of the hysteresis circuit is connected with the power circuit, the other end of the hysteresis circuit is connected between the voltage division circuit and the comparison circuit, and the hysteresis circuit is used for increasing the first voltage when the driving circuit outputs the first reference voltage to the power circuit. The power circuit is controlled through the voltage division circuit, the comparison circuit and the driving circuit, the cost can be reduced, and the occupied space is small.

The invention relates to the technical field of semiconductor design and manufacturing, in particular to an operation method and a design method of a multi-core chip and the multi-core chip. According to the technical scheme, circuit logics which can accept manufacturing defects are divided into the first logic group, and circuit logics which cannot accept manufacturing defects are divided into the second logic group; by reading the defect state of at least one computing core on the multi-core chip, the availability of a first logic group capable of accepting manufacturing defects in the computing core can be determined; and when the defect state indicates that the first logic group is unavailable, configuring a control register in the computing core to close the first logic group, and keeping a second logic group which is not accepted to manufacture defects in the computing core in a running state without influencing the functional circuit logic of the computing core. According to the technical scheme, the circuit logic, capable of accepting manufacturing defects, of the multi-core chip still has usability when the manufacturing defects occur, and the overall yield of manufacturing of the multi-core chip is improved in a disguised mode.

The invention provides a feedback circuit, a DCDC conversion circuit, a chip and electronic equipment. The feedback circuit comprises a first clamping circuit, a digital-to-analog conversion circuit, a voltage and current conversion circuit and a first voltage division circuit. The first clamping circuit is used for receiving a first reference voltage and clamping the voltage of the input end of the digital-to-analog conversion circuit at the first reference voltage, and the digital-to-analog conversion circuit is used for converting the first reference voltage into a first voltage according to a received binary code value of a set output voltage; the voltage and current conversion circuit is used for converting the first voltage into first current; the first voltage division circuit is used for generating a feedback voltage according to the actual output voltage of the DCDC conversion circuit and the first current and transmitting the feedback voltage to the control circuit. According to the feedback circuit provided by the invention, the direct-current signal feedback coefficient and the alternating-current signal feedback coefficient are separately designed, the alternating-current signal feedback coefficient is reasonably designed, the problem of small alternating-current feedback quantity fed back to the control circuit in the related technology is solved, and the transient response performance of the system is improved.

The invention discloses a final-stage voltage tracking anti-clipping circuit for an audio power amplifier, and relates to the technical field of power amplifiers, and the circuit comprises a voltage division circuit which is used for receiving final-stage voltage from target power amplifier equipment and generating a combined voltage signal; the audio attenuation module is used for receiving an audio input signal and a final-stage voltage, and judging whether amplitude limiting modulation is carried out on the audio input signal or not to complete power amplifier output by judging whether a starting signal is received or not; and the starting judgment module is used for receiving the combined voltage signal and the first output signal, and comparing the combined voltage signal with the first output signal to generate a starting signal. According to the invention, the collected final-stage voltage of the target power amplifier is set as the dynamic amplitude limiting threshold, so that an over-high signal can be effectively suppressed to a safe range quickly when the power supply drops instantaneously, and the effects of avoiding hearing deterioration caused by power amplifier signal waveform truncation and avoiding potential safety hazards caused by amplitude limiting and topping to the loudspeaker are achieved.

A power supply applied to high-voltage input and low-ripple output of a high-voltage optical storage system comprises a filtering unit and a power taking photovoltaic high-voltage input bus; a voltage division circuit divides the output of the filter unit to charge an energy storage capacitor so as to supply power to the drive circuit unit; the flyback circuit unit comprises a flyback transformer, MOS (Metal Oxide Semiconductor) tubes and multiple flyback transformer windings, the driving circuit unit outputs synchronous PWM (Pulse Width Modulation) signals to control the MOS tubes, each primary winding is bridged with the RCD absorption circuit and then is connected to the D pole of the MOS tube, the S pole of the MOS tube is connected with the next adjacent primary winding, and the flyback circuit unit inputs a voltage division circuit which is formed by bridged multiple resistors in series. The resistance is divided into equal parts corresponding to the number of windings, the S pole of each MOS tube is connected to a contact between two adjacent equal parts of series resistors, and the two ends of each equal part of series resistor are connected with a filter capacitor in parallel; the secondary output of the transformer is divided into multiple paths, one path forms first direct current output through the linear adjusting circuit unit, and the other path forms second direct current output through the rectifying and filtering circuit unit.

The invention provides a reference voltage buffer circuit of a high-precision analog-to-digital converter and a calibration method of the reference voltage buffer circuit, and the reference voltage buffer circuit is characterized in that the inverted input end of a first operational amplifier is connected with a reference voltage, and the output end of the first operational amplifier is in feedback connection with the in-phase input end through a first driving tube and a voltage division circuit; the inverted input end of the third driving tube is connected with the second voltage dividing node, the output end of the third driving tube is connected with grid electrodes of a plurality of third driving tubes and second driving tubes, and drain electrodes of the third driving tubes are connected to the first voltage dividing node through switches; the width-to-length ratios of the second driving tube and the plurality of third driving tubes are in a linear relationship; logic control signals are input into the plurality of switches and are used for controlling the states of the switches to perform linear calibration of the reference voltage. Linear calibration of the output reference voltage is controlled through binary coding, the total resistance is greatly reduced by designing the linear relation between the resistors, and the effects of reducing the chip area and reducing the cost are achieved.

The utility model relates to the technical field of frequency detection, and discloses a frequency detection circuit, which comprises a voltage division circuit, a hysteresis comparison circuit and a frequency calculation unit, and is characterized in that a first end of the voltage division circuit is connected with a positive end of a reference power supply, and a second end of the voltage division circuit is connected with a first input end of the hysteresis comparison circuit; the third end of the comparator circuit is connected with the output end of the hysteresis comparison circuit; the second input end of the hysteresis comparison circuit is connected with a first power supply, the first power supply end of the hysteresis comparison circuit is connected with the positive end of an external power supply, the second power supply end of the hysteresis comparison circuit is grounded, and the output end of the hysteresis comparison circuit is connected with the input end of the frequency calculation unit; the frequency calculation unit calculates an output frequency of the first power supply based on a first level signal and a second level signal. According to the utility model, when the first power supply voltage is in zero-crossing oscillation in a hysteresis range, a level signal which is not overturned is output, so that the accuracy and the stability of a frequency detection result are improved.

The invention discloses a signal identification method and device, electronic equipment and a storage medium, and relates to the technical field of computers, the identification method is applied to a backboard in target equipment, and the backboard is connected with a mainboard through a first connector; the backboard is connected with the switch through the second connector. The first connector is connected with the voltage division circuit; the second connector is connected with a grounding resistor, and is used for receiving a signal which is output after voltage value conversion is carried out on a mainboard signal sent by the mainboard port by the voltage division circuit, or receiving a second voltage signal which is output after voltage value conversion is carried out on a switch signal of the switch by the grounding resistor, and switching the switch on the basis of the received voltage signal; and determining the voltage value of the voltage signal so as to identify the source of the voltage signal according to the voltage value. As the voltage value is wide in recognizable range relative to the address bit, the technical effects of increasing the expandability of the target equipment and improving the performance of the target equipment can be achieved, and the technical problem that the expandability of the current target equipment is limited is solved.

The invention provides a crystal oscillator taming system based on a temperature compensation chip, which comprises a crystal oscillator, the temperature compensation chip, a frequency dividing circuit, a phase measurement module, a microcontroller and a digital-to-analog converter, and is characterized in that the temperature compensation chip is used for performing temperature compensation on the crystal oscillator; the frequency dividing circuit is used for performing frequency dividing processing on an output signal of the crystal oscillator; the phase measurement module is used for measuring the phase difference between the frequency division signal and the reference signal; the microcontroller is used for storing and periodically updating frequency compensation values of the crystal oscillator at different temperatures; the processing module is also used for processing the phase difference based on a Kalman filtering algorithm when the reference signal is valid, and processing the filtered phase difference based on a PID control algorithm when the filtered phase difference is greater than or equal to a preset threshold value; the digital-to-analog converter is used for converting the adjusted phase difference into an analog signal. The invention provides a crystal oscillator taming system based on a temperature compensation chip. The system is used for solving the problem that in the prior art, temperature compensation only depends on the temperature compensation chip, and the occasion with the high frequency precision requirement cannot be met.

The invention discloses a high-voltage positive and negative pulse detection circuit, which relates to the technical field of signal conditioning, and is characterized in that a voltage division circuit is responsible for attenuating input pulse signals, a switching diode is responsible for rectification and inputting positive and negative pulse signals into corresponding conditioning circuits respectively, and a charging circuit is responsible for maintaining pulse width characteristics of the signals; and the steepness of the signal edge is ensured by the comparator, and FPGA identification can be realized. Uncertain high-voltage pulse signals can be processed, and application scenes are diversified. The edge characteristic, pulse width and pulse direction of the pulse signal can be identified, and the signal processing capability is prominent.

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 milliohm-level resistance real-time measuring circuit which comprises a power supply circuit, a voltage division circuit, an operational amplifier circuit, a lifting circuit, an ADC acquisition module, an MCU and an LED display screen which are sequentially connected in series, the MCU is connected with the power supply circuit through a relay switch circuit, and the power supply circuit is connected with the voltage division circuit through a current mutual inductance circuit. The invention also discloses a milliohm-level resistor real-time measurement method, which comprises the following steps of: utilizing the measurement circuit, performing wiring measurement on the measured resistor by adopting a four-wire method, controlling the relay by the MCU to circularly switch on power supply in real time, performing voltage division, operational amplification and lifting processing on a signal, then performing segmented acquisition, performing effective acquisition value judgment and A / D conversion by the MCU, and finally displaying a calculated resistance value on the LED display screen. The invention belongs to the technical field of circuit measurement, adopts segmented acquisition, is high in acquisition precision and high in stability, and can continuously and circularly measure in real time for a long time as a relay is switched on for power supply at regular time.

The present invention discloses a backup battery undervoltage management circuit and method, comprising: an MCU circuit, an OR gate circuit, a battery voltage detection circuit, a resistor voltage divider circuit and a switch circuit; the MCU circuit sets a high or low level for a first output terminal and a second output terminal according to the working state of a vehicle-mounted terminal and / or the detected backup battery power; the OR gate circuit is used to determine whether a high level is output; the battery voltage detection circuit is respectively connected to the backup battery, the MCU circuit, and the OR gate circuit to detect whether the backup battery is undervoltage; the resistor voltage divider circuit is arranged between the backup battery and the MCU circuit, and when the vehicle-mounted terminal is not in a dormant state, the MCU circuit detects the output of the resistor voltage divider circuit; the switch circuit is arranged between the OR gate circuit and the backup battery, and controls whether to power the MCU through the OR gate circuit. The present invention can accurately and timely detect whether the backup battery is undervoltage, and perform corresponding actions to turn off or on the backup battery.

The invention provides a driving circuit and a display panel, a gate driving circuit of the driving circuit comprises a cascade transmission circuit, an output circuit and an output frequency dividing circuit, the output circuit is electrically connected with the cascade transmission circuit, the output frequency dividing circuit is connected between the cascade transmission circuit and the output circuit, and the output circuit is electrically connected with at least one clock signal line. The clock signal lines connected with two adjacent stages of gate drive circuits are different, and in each clock signal line, the width between the starting moments of two adjacent effective levels is greater than or equal to the product of the width of the effective level and 8; the width between two adjacent effective levels in each clock signal line is increased, so that the width between ripples caused by jumping of clock signals is increased, the situation that a data writing stage of a pixel driving circuit in the display panel is not overlapped with the ripples is avoided, the influence of the ripples on sub-pixels is eliminated, and the display quality is improved. The phenomenon of frequency division boundary abnormity in the frequency switching area is avoided, and the display effect of the display panel is improved.