596results about How to "Simple circuit structure" patented technology

The invention discloses a backlight source driving circuit and a driving circuit thereof as well as a liquid crystal television which are provided mainly aiming at the problems of multiple components, complicated structure and the like of the existing backlight source driving circuit. The backlight source driving circuit disclosed by the invention comprises a backlight source power supply circuitand a control circuit, wherein the backlight source power supply circuit supplies the voltage which is needed by the operation to a backlight source load according to the received driving pulse signals which are output by the control circuit; and the control circuit responses to control voltage signals, samples the operating current of the backlight source load in real time, and generates and outputs the corresponding driving pulse signals according to the sampled current signals. The backlight source driving circuit disclosed by the invention has the advantages of simple structure and stabledriving.

The invention discloses an electric-heating full-automatic soybean milk machine with fuzzy control, comprising a nose, a cup body, a motor, a motor transmission shaft, a rotary blade, a heating element, a temperature-measuring sensing head, an anti-overflow sensing head, an anti-dry-burning sensing head and a control circuit board, wherein because of the adoption of the control circuit board, a preparation method of soybean milk, is programmed and systemized, intelligent control on the processing process of the soybean milk is realized by a single chip microcomputer, especially the functions of automatically adjusting the heating power according to the temperature and controlling the temperature rising rate can be introduced during a plurality of time intervals in the processing process of the soybean milk.

The invention discloses an interleaved parallel PFC control circuit for controlling parallel PFC circuits, wherein a sampling module samples alternating current input voltage, PFC bus voltage and PFC bus current; a processing module processes the sampling signals and a reference voltage signal to generate a control signal; a comparing module compares the control signal with a first carrier signal and a second carrier signal to generate a first duty ratio signal and a second duty ratio signal, wherein the first carrier signal and the second carrier signal are interleaved by a specified phase angle and have the same wave shape; and a selecting module alternates the first duty ratio signal and the second duty ratio signal respectively according to the period thereof to be used as the driving control signal of one of two parallel PFC circuits to another to be output. The invention also discloses an interleaved parallel PFC control method. The invention can effectively avoid the problem of unbalanced current caused by asymmetrical driving signals of the prior interleaved parallel circuit, and has simple realization and low cost.

Power supply stand output to the portable device is adjusted according to the power adjustment signals. Maximum power supply stand output is limited to a power output threshold value. The portable device compares the power received from the power supply stand to the required power. When the received power is lower than the required power, the portable device sends a power adjustment signal to the power supply stand, which is an increase-power-request signal. When the received power is greater than the required power, the portable device sends a decrease-power-request signal to the power supply stand. The power supply stand adjusts output and limits it to the power output threshold value. When continuous output of increase-power-request signals from the portable device is detected over a preset time period, a foreign object is determined to be on the power supply stand.

The invention discloses a direct-current power flow controller for a multiport flexible direct-current power transmission system and a control method. The direct-current power flow controller comprises two adjustable voltage sources which are respectively connected in two adjacent power transmission lines in series, wherein two by-pass switches are respectively in parallel connection with the two adjustable voltage sources, and four switch tubes and four diodes are distributed on two sides of an inductor after being connected in series. Current of the power transmission line where a certain adjustable voltage source is located is acquired and subtracted from a given current reference value and then is subtracted from acquired voltage of the adjustable voltage source after a PI link and a delay link, PWM drive signals of the switch tubes are obtained by performing the PI link on a difference value, and turning-on and turning-off of the switch tubes are controlled to enable the current of the power transmission line where the adjustable voltage source to serve as a given reference value. The direct-current power flow controller is simple in circuit structure, is provided with few switch devices and does not need an isolation transformer and an external power supply.

A method for determining an ending of a frame in serial data is provided. The frame has in sequence a header, a data stream, and a cyclic redundancy check (CRC) corresponding to the data stream. The last bit of the frame is the last bit of the CRC. The method includes (a) detecting the header of the frame, (b) determining the initial bit of the data stream according to the header of the frame, (c) utilizing a generator polynomial corresponding to the CRC of the data stream to perform CRC calculation on the initial bit of the data stream, in order to generate a remainder, and (d) comparing the remainder with a fixed value, wherein the last bit of the plurality of bits is determined to be the ending of the frame when the remainder equals to the fixed value.

The invention provides a modularized multi-level converter with the direct-current fault ride-through capacity, wherein modules are divided into the first module and the second module. The structure of the first module is the same as the structure of a module in a traditional modularized multi-level converter, and a few semiconductor switches, a few diodes and a few damping resistors are added to the second module on the basis of the first module. The first module and the second module both have the level superposition function, but only the second module has the direct-current fault ride-through capacity. The modularized multi-level converter with the direct-current fault ride-through capacity not only can achieve the functions of a traditional modularized multi-level converter, but also has the direct-current fault ride-through capacity. Compared with an existing modularized multi-level circuit with the direct-current fault ride-through capacity, the circuit of the modularized multi-level converter is provided with fewer devices and simple in structure. The modularized multi-level converter is applicable to modulation and control strategies of the traditional modularized multi-level converter, applicable to high-voltage high-power occasions and particularly suitable for the high-voltage direct-current power transmission field in which a modularized multi-level converter is applied and prone to direct-current faults.

The invention discloses an electrically-controlled tee valve comprising a valve body and a valve core. The valve body is provided with a cavity. The sidewall of the valve body is provided with a first valve opening, a second valve opening and a third valve opening all communicated with the cavity. The valve core is movably disposed within the cavity. At least one end, along the moving direction of the valve core, of the inside of the cavity is provided with an electric controller used for controlling motion of the valve core. By controlling the motion of the valve core, a passage between the first valve opening and the second valve opening or that between the first valve opening and the third valve opening can be selectively closed. A washer is characterized in that a water outlet of a drain pump is provided with the electrically-controlled tee valve; the first valve opening is connected to a water outlet of the drain pump; the second valve opening is connected to a circulating water pipe; the third valve opening is connected with a drain pipe. The electrically-controlled tee valve is simple in structure and convenient to control; by the application of the electrically-controlled tee valve in washers, circulation of washing water or selective control of sewage drainage is facilitated, and automation of the washers is further achieved.

A capacitor charging apparatus includes a transformer and an output capacitor charged with current flowing through a secondary coil of the transformer, and charges the output capacitor by performing a switching control of a switching transistor provided on a path leading to a primary coil of the transformer. A switching control unit controls on and off of the switching transistor. A voltage detector monitors a voltage at a tap provided in the secondary coil of the transformer. The switching control unit regards the voltage detected by the voltage detector as an output voltage of the capacitor charging apparatus, and controls the on and off of the switching transistor.

The invention discloses an improved single-slope serial analog-digital converter, which comprises a ramp generator, a comparator, an adding counter and a system clock module; an output of the ramp generator is connected with an inverting input end of the comparator; an analog signal is connected with a non-inverting input end of the comparator; an output of the comparator is connected with an input end of the adding counter; and a control signal generated by the system clock module is respectively connected with the ramp generator and a clock control end of the adding counter. The phase and amplitude of a voltage ramp are adjusted by adopting a feedback mode, so that the influence of device parameter deviation on ramp voltage precision is reduced. The improved single-slope serial analog-digital converter overcomes the defect that the performance of the conventional single-slope serial analog-digital converter is influenced by an error of the ramp generator, and has conversion time thesame as that of the single-slope serial analog-digital converter. The improved single-slope serial analog-digital converter has a simple circuit structure; the whole system consists of elementary analog and digital modules; the design and analysis are quite simple; and the improved single-slope serial analog-digital converter is applicable to portable products in the pursuit of cost reduction andquick marketing.

The invention discloses a voltage feedback single stage power factor correcting circuit, which comprises a second rectifier, a boosting inductance, a capacitor, a transformer voltage feedback circuit, a high-frequency switch tube and a transformer with a centre tap. The input AC is transferred to the boosting inductance for charging after being rectified by the second rectifier circuit to double pulse DC; the boosting inductance transfers the output current of the second rectifier to the transformer with a centre tap, and transfers the power to the secondary side for outputting through the transformer; the capacitor is used for balancing the power, reducing the output ripple waves; and the transformer voltage feedback is used for coupling the bus voltage with the boosting inductance, so as to further limit over high bus voltage. The invention improves circuit efficiency, and has the advantages of simple structure, easy realization, low cost, low circuit loss, and the like.

The invention belongs to the field of electronic technology and relates to an integrated level displacement circuit, which consists essentially of seven circuit units including input buffer 1, permanent current source switch A and B, pulse self-generating A and B, grid electrode pull-down 6 and phase inverter 7. Through inputting buffer 1, low logic signal IN generates in-phase and anti-phase control signals S1 and S2 used for controlling permanent current source switch A and B to obtain permanent current output signal S3 and S4; obtains narrow pulse pull-down current S5 and S6 through pulse self-generating A and pulse self-generating B circuit; and generates VB-VH floating level displacement signal S7 through grid electrode pull-down 6 circuit. After S7 passes through phase inverter 7, high logic signal Vout-VB that is the same as and synchronous with the low logic signal IN will be generated between the output end of the phase inverter 7 and the high-end floating VB. The invention has advantages of simplicity of circuit, low requirements for the device, low self-consumption of power, mis-triggering avoidance, stable working condition, easiness for integration and suitability for high-pressure application.

The invention relates to an overpower compensating method and an overpower compensating method for the wide voltage-input flyback power supply. The device comprises a flyback transformer of a flyback power supply, an OPP overpower compensating circuit and a PUM control IC serving as the flyback power supply. The method and the device are characterized in that: a winding is arranged on a primary side of the transformer, one end of the winding used as an unlike end is connected with a primary side reference ground, while the other end used as a like end transmits the voltage, which is generated by coupling, to an OPP overpower protection and detection functional end CS of the PUM control IC serving as the flyback power supply by the OPP overpower compensating circuit to perform the OPP overpower compensation. The method and the device can make an overpower protection point of a wide power supply (which inputs a 90-264 Vrms alternating current) closer and the OPP overpower compensating circuit does not work at a light load, which means the OPP compensating power has no power loss when a light load is output, so the method and the device can be applied to a flyback type wide-range power supply with low requirements on standby power consumption, the use is convenient and safe and the damages of parts, such as a switch MON tube, caused by output overload or short circuit are also reduced simultaneously.

The invention discloses a high-voltage flexible LED patch lamp tape and a manufacturing technology and a mounting method thereof. The high-voltage flexible LED patch lamp tape is mainly composed of one lamp tape unit or more than one lamp tape units connected back and forth. Each lamp tape unit comprises a transparent flexible casing and a double-sided flexible strip circuit board encapsulated in the transparent flexible casing. The front and rear ends of each lamp tape unit are respectively sleeved with an end cap, and more than one lamp tape unit can be connected back and forth through connecting parts matched with the end caps. Compared with the prior art, the high-voltage flexible LED patch lamp tape has the advantages that the high-voltage flexible LED patch lamp tape is light in weight, small in size, process saving, safe and reliable, convenient to mount, and the like.

The invention discloses a wireless sensor network node solar charging and storage battery discharging protective circuit in a solar power supply device. A charging protective circuit comprises a comparator AR1, a triode VT1, a voltage stabilizing tube D1 and a shunt regulator J1; a discharging protective circuit comprises a comparator AR2, a shunt regulator J2, a triode VT5 and P-MOS (P-Metal Oxide Semiconductor) tubes VT2 and VT4, as well as an N-MOS (N-Metal Oxide Semiconductor) tube VT3; when the voltage of a storage battery is close to a rated voltage -10%, the discharging protective circuit is positioned in a low-threshold voltage UTHL state of a hysteresis region; when the voltage of the storage battery is close to UTHL +0.3V, the discharging protective circuit is positioned in a high-threshold voltage UTHH state of the hysteresis region; through the adoption of the wireless sensor network node solar charging and storage battery discharging protective circuit disclosed by the invention, voltage difference of storage battery discharging protection and power supply recovery is achieved, voltage oscillation phenomenon of the discharging protective circuit during acting is eliminated, overcharging of a solar cell panel in the charging process is effectively prevented, and the storage battery cannot be damaged by over-discharge under the circumstance that continuous sun exposure is not enough.

The invention provides a drive circuit capable of achieving two-way transmission of signals and a shifting register thereof. The drive circuit comprises a first transistor, a second transistor and a third transistor, wherein the first end of the first transistor is electrically connected with the (n-2)th grid drive terminal, the control end of the first transistor is electrically connected with the (n-4)th control terminal, the first end of the second transistor is electrically connected with the second end of the first transistor to form a common node, the second end of the second transistor is electrically connected with the (n+2)th grid drive terminal, the control end of the second transistor is electrically connected with the (n+4)th control terminal, the first end of the third transistor receives a high frequency clock pulse signal, the second end of the third transistor is electrically connected with the nth grid drive terminal, and the control end of the third transistor is electrically coupled to the second end of the first transistor. Accordingly, the second transistor has charging and discharging functions at the same time by means of two-stage potential voltage of the common node, and therefore two-way transmission of signals is achieved. Compared with the prior art, the drive circuit is simple in structure and smaller in layout area.

The invention relates to an over-voltage lockout protection circuit, which comprises an acquisition detection module and a protection execution module, wherein the acquisition detection module is used for detecting a working electric signal of an LED load and generating a first control signal according to the working electric signal; the protection execution module generates a second control signal according to the first control signal, and the second control signal is used for controlling the disconnection of switching power circuit which supplies power to the LED load and realizing the lockout; and the working electric signal is a voltage signal and/or a current signal. The invention also relates to an LED drive circuit using the over-voltage lockout protection circuit. In the over-voltage lockout protection circuit and the LED drive circuit, when over-voltage is output, the over-voltage lockout protection circuit can quickly turn off and lock the switching power circuit so that thewhole circuit is in a low power consumption turn-off state and the energy consumption loss during a failure is reduced. The over-voltage lockout protection circuit and the LED drive circuit have simple structures, are suitable for ship-borne light fittings, and can well solve the problem that the output voltage of a ship-borne power supply system fluctuates to result in short service life of an LED light source.

The invention discloses an integrated highly-reliable magnetic suspension energy storage flywheel digital control device, which is a device capable of controlling a magnetic suspension energy storage flywheel system motor and an electromagnetic bearing, and comprises an interface circuit, a field programmable gate array (FPGA) system, a magnetic bearing control power module, a motor control powermodule, a magnetic suspension energy storage flywheel system, and a sensor circuit, wherein the FPGA system acquires a magnetic bearing rotor displacement signal, a rotation speed signal, a magnetic bearing coil current, a motor winding current, and the like through the interface circuit. On one hand, the FPGA system performs active control on the electromagnetic bearing according to the magneticbearing rotor displacement signal, the magnetic bearing coil current and the rotation speed signal; on the other hand, the FPGA system controls the rotation speed of the flywheel according to a rotation speed instruction, the motor winding current and the rotation speed signal. By the invention, integrated design of a magnetic bearing digital controller and a motor digital controller is realized,the integration level and reliability of magnetic suspension energy storage flywheel system controller is improved, the volume and weight are reduced, and the power consumption of the controller is lowered.

The invention discloses a three-PWL double-current hysteresis power amplifier which comprises an error comparing module, a PI current controller module, a double-current hysteresis comparing module, an optical coupler isolation driving module, a power changing module and a current feedback current. The traditional current hysteresis control and the three-PWL modulation are combined, thus, the advantages of simple structure, good current tracking performance and low cost of the hysteresis control circuit and the advantages of small current ripples, high control accuracy and low output harmonic wave content are obtained. The power amplifier can be used for all occasions with the requirements of controlling the output current, i.e. the power amplifying part of an active electromagnetic bearing or a vibration generator, and the like.

The invention relates to a low dropout regulator. The low dropout regulator comprises a feedback circuit, a reference voltage unit which is connected with the cathode of an error amplifier. A control end of a first on-element in the feedback circuit is connected with an output end of the error amplifier. An input end of the first on-element and an output end of the first on-element are respectively connected with a power supply and an output end of the regulator. A resistor branch and a circumscribed capacitor branch are connected between the output end of the regulator and ground in parallel. The resistor branch is provided with a first resistor and a second resistor. The first resistor and the second resistor are in series. The anode of the error amplifier is connected with the first resistor and the second resistor. The first resistor and the second resistor feed back signals. An output end of a second on-element is connected with the ground through a third resistor. An input end of the second on-element is connected with the output end of the regulator, and a control end of the second on-element is connected with the output end of the error amplifier. The problems that transmission voltage fluctuation is too large and stable time is too long caused by load current saltus step of the low dropout regulator are solved, static power consumption increase is reduced to a maximized degree, the circuit structure is simple, transient response speed and precision of low dropout regulator (LDO) circuits are greatly improved.

The invention discloses a power factor monitoring and compensating system which consists of an upper computer and a lower computer. The upper computer mainly consists of a real-time database and a configuration software core; the lower computer mainly consists of a microprocessor (1), a current and voltage transformer (2), a signal amplifying circuit (3), a comparison shaping circuit (4), a phase difference pulse width signal generating circuit (5), a keyboard input module (6), a liquid crystal display circuit (7), a capacitor switching control circuit (8), an LED (light-emitting diode) alarm indicator lamp (9) and a Flash memory (10); and the lower computer is communicated with the lower computer through an RS232 interface. The system has the characteristics that the circuit structure is simple, the control accuracy is high, and distributed application is convenient.

The invention provides a battery charging circuit and a control circuit and control method of the battery charging circuit. The battery charging circuit is used for controlling the charging of a battery. The control circuit comprises a feedback amplifier, a selection circuit, a delay control circuit, a comparison circuit and a logic circuit, wherein the feedback amplifier receives a feedback signal and a feedback reference signal and outputs a feedback amplification signal from an output end; the selection circuit selects a smaller one of a current reference signal and the feedback amplification signal as a current control signal and outputs the current control signal to the output end; the delay control circuit inputs a voltage, a charging voltage and a control signal on the basis of the current control signal and outputs a current lower limit signal from a first output end and a current upper-limit signal from a second output end; the comparison circuit outputs a setting signal from the first output end and a resetting signal from the second output end on the basis of the current upper-limit signal, the current lower-limit signal and a current detection signal; and the logic circuit outputs a control signal from the output end on the basis of the setting signal and the resetting signal.

The invention discloses an equalizing charge management system of a lithium ion power battery pack. The system comprises an external voltage alternating current converter, an MCU central processing unit, a voltage, current and temperature monitoring module used for monitoring battery information, a plurality of equalizing charge modules, a battery heat radiating module and a plurality of battery modules, wherein the voltage, current and temperature monitoring module feeds the monitored information back to the MCU; the MCU analyzes the information and sends a command to the equalizing charge modules and the battery heat radiating module to control charge equalization of every battery in the battery modules; each battery module is connected with one equalizing charge module; each equalizing charge module consists of a control switch, a spoiler and a transformer; the control switch is connected with the spoiler and the transformer respectively; the control switch is connected with the external voltage alternating current converter; the spoiler is connected in parallel with the battery modules; and the transformer is connected in parallel with the battery modules. The equalizing charge management system realizes high-current equalizing charge in a mode of early-constant current and later-disturbed flow.

The invention provides a direct-current offset calibration method and device, wherein the method comprises the following steps: judging whether the output of a zero intermediate frequency receiving system is in accordance with a convergence condition by feeding back an analogue base-band differential voltage output by the zero intermediate frequency receiving system; and calibrating the base-band signal of the zero intermediate frequency receiving system. In the process of calibration, the adjust values calibrated every time are set by using a gradually stepping manner in descending order, and then the adjust values calibrated every time are superimposed so that the whole direct-current offset calibration process has the effect of firstly roughly adjusting and then transiting to micro-adjustment gradually; and the direct-current offset calibration can be realized quickly and accurately in order to meet the convergence condition. Moreover, the direct-current offset calibration is carried out on a time division duplex (TDD) zero intermediate frequency receiving system by using the non-receiving data time slot of the TDD zero intermediate frequency receiving system, so that the real-time performance of direct-current offset calibration is improved.

The invention discloses an LED lamp with the light color adjusting function. The LED lamp comprises a lamp holder, a lamp body and a handle, wherein three LED lamp sets are arranged in the lamp holder and each LED lamp set comprises a high color temperature LED string and a low color temperature LED string. An adjustable drive module, a light color adjusting module and a rechargeable battery are arranged in the handle, and the handle is connected with the lamp body via a multi-shift adjustable rotary knob. The light color adjusting module comprises two brightness adjusting rotary knobs and three dial switches which work together to control the lamp to emit lights with high color temperature, low color temperature and moderate color temperature between the high and low color temperatures, as a result, the adjustment of the color temperature, the spectrum and the brightness can be realized. According to LED lamp disclosed by the invention, the light control signal generation circuit has a simple structure, the linearity of the operation signal is good, the lamp is widely applicable for indoor purposes and outdoor occasions without external power sources and in need of extensive light adjustment of multiple lamps, and further, the modular structure of the lamp brings convenience in installation, maintenance and light emitting angle adjustment.

The invention provides a shift register unit and a gate drive device. The shift register unit comprises a latch and a control circuit, wherein the control circuit comprises a first thin film transistor, a second thin film transistor and a third thin film transistor; the gate of the first thin film transistor is connected with a clock signal input end; the source of the first thin film transistor is connected with a signal input end; the drain of the first thin film transistor is connected with the input end of the latch; the gate of the second thin film transistor is connected with the clock signal input end; the source of the second thin film transistor is connected with a first signal output end; the gate of the third thin film transistor is connected with the signal input end; the source of the third thin film transistor is connected with a high-level signal input end; the drain of the third thin film transistor is connected with the drain of the second thin film transistor; the latch comprises a first phase inverter and a second phase inverter which are connected with each other end to end; the input end of the latch is connected with a second signal output end; the output end of the latch is connected with the first signal output end; and the levels of output signals of the first signal output end and the second signal output end are opposite. According to the shift register unit, the circuit is simple in structure, a small number of signal wires are arranged, the power consumption is low, and the area of a layout is small.

The invention discloses a new energy automobile charging gun with a charging gun head achieving a temperature protection function. The new energy automobile charging gun comprises a charging plug, an on-cable control box and the charging gun head; the on-cable control box comprises an outer power supplying control device which comprises a PWM output end and a PWM monitoring end, the PWM output end is connected with a CP signal wire jack, and the PWM monitoring end is connected between the PWM output end and the CP signal wire jack; a temperature-controlled switch is fixedly arranged in a shell, and the two ends of the temperature-controlled switch are connected with a ground wire jack and a CP signal wire respectively; a live wire and a null wire are each provided with a switch. According to the new energy automobile charging gun with the charging gun head achieving the temperature protection function, the circuit structure is simple, and the purpose of automatically controlling charging according to the temperature is achieved by adopting the mode that the temperature-controlled switch intervenes in CP signals; the condition that in the prior art, due to the fact that a signal cannot be sent out in time to inform the on-cable control box on the condition that the temperature of the charging gun head is abnormal, heat is accumulated more and more, and a short circuit between a socket and the plug is generated is overcome.

The invention discloses an over-temperature protection circuit. The over-temperature protection circuit comprises a constant current generation circuit, an output control circuit and an output shaping circuit. The constant current generation circuit is used for providing a stable current bias for the over-temperature protection circuit. The output control circuit is used for converting a temperature signal into an electric signal and controlling output of the over-temperature protection circuit. The output shaping circuit is used for shaping output of an output signal of the output control circuit. A first resistor and an M1 tube are used for real-time detection of a chip temperature and making a response. The over-temperature protection circuit is simple in structure, and does not need any high-precision voltage comparator. The component number is low, temperature control precision is high, a turn-off signal can be generated at a heat turn-off temperature threshold point accurately, debugging is convenient, the over-temperature protection circuit has a temperature hysteresis function, heat oscillation of the chip near the temperature threshold point is prevented, and the over-temperature protection circuit is suitable for usage in chips of power supply management or LED driving and the like.

The invention belongs to the technical field of integrated circuits, in particular to a switching frequency control circuit for a fixed off time control mode boost DC-DC converter. The circuit consists of an off time timer and a frequency lock circuit, solves the defect that the working frequency changes along with the working condition under the traditional fixed off time control mode, preciselyfixes the working frequency on the reference frequency and reduces the electromagnetic interference (EMI). The circuit of the invention has the advantages of simple structure, reliable function and favorable application prospect, is also suitable for DC-DC converters of other types (such as buck type) and the fixed on time control mode.

The invention discloses a shift register unit, a driving method, a gate drive circuit and a display device, and belongs to the technical field of display. The shift register unit comprises an input module, an output module, a pull-down control module and a pull-down module; the input module is used for inputting an input signal from a signal end into a pull-up node under the control of a first clock signal from a first clock signal end; an output module is used for inputting a second clock signal from a second clock signal end into an output end under the control of the pull-up node; the pull-down module is used for inputting a first clock signal into the pull-down node under the control of the first clock signal and inputting a power signal from a power end into the pull-down node under the control of the pull-up node; the pull-down module is used for inputting the power signal into the output end under the control of the pull-down node. Accordingly, the layout area occupied by the gate drive circuit in the display device is reduced, and narrow bezel is obtained conveniently.