254 results about "Negative power" patented technology

The ultralow frequency sensor comprises a vibration detection unit, a power supply voltage stabilization unit and a signal conditioning unit, the power supply voltage stabilization unit is provided with a low dropout linear voltage regulator U20, a voltage converter U19 and a negative voltage regulator U21, and the low dropout linear voltage regulator U20 stabilizes an external power supply as a positive power supply VCC; the voltage converter U19 is used for converting positive voltage of an external power supply into negative voltage and outputting stable negative power supply VEE through the negative voltage stabilizer; the positive power supply VCC and the negative power supply VEE supply power to the signal conditioning unit; the signal conditioning unit comprises a high common mode rejection differential amplifier, a differential-to-single-ended amplifier, a band-pass filter and a differential output driver, a differential signal output by the vibration detection unit sequentially passes through the high common mode rejection differential amplifier, the differential-to-single-ended amplifier, the band-pass filter and the differential output driver, and then a differential voltage signal is output; the method has the advantages of high stability and reliability and the like.

The invention belongs to the field of power device driving, particularly relates to the technical field of crosstalk suppression, and more particularly relates to a crosstalk suppression driving circuit. Through cooperative work of the driving module, the detection module, the buffering module and the clamping module, crosstalk is effectively suppressed while the switching speed is ensured. The driving module ensures normal switching action of the power device; the detection module converts the drain voltage change rate into a detection signal in real time, and recognizes the crosstalk risk in advance; the buffer module suppresses forward crosstalk by absorbing grid forward voltage spikes; the clamping module immediately conducts a low-impedance path from the grid electrode to the negative power supply when the detection signal exceeds a threshold value, and negative crosstalk is quickly eliminated. According to the design, the suppression circuit is only activated when the voltage change rate exceeds the standard, switching delay caused by a traditional fixed buffer circuit is avoided, accurate and rapid crosstalk suppression can be achieved, and finally the suppression effect and the system reliability are remarkably improved while the high-speed switching performance is maintained.

The invention discloses a passive multi-stage voltage soft turn-off circuit suitable for SiC MOSFETs. The passive multi-stage voltage soft turn-off circuit comprises a driving main branch, a plurality of voltage reduction branches, a driving resistor, a discharging resistor and a driving power supply circuit. The driving power supply circuit is powered by a positive power supply VCC when the SiC MOSFET is turned on, and is powered by a negative power supply VEE when the SiC MOSFET is turned off. The voltage reduction branches are connected to the two ends of the driving main branch in parallel. The step-down branch comprises a step-down delay unit, a step-down action unit and a step-down unit which are sequentially connected in series; the delay time of each step-down branch is increased in sequence, and the step-down voltage drop is increased in sequence. According to the invention, the voltage level can be conveniently controlled by changing the number of the voltage reduction branches, an additional power supply module does not need to be added, the voltage reduction time can be controlled by the voltage reduction delay branches, the degree of freedom of driving is greatly increased, and the circuit is low in complexity, high in voltage reduction degree of freedom and high in reliability.

The utility model discloses a parallel operation copper bar and system of an electronic load, and the parallel operation copper bar comprises a positive electrode copper bar which is used for connecting the positive electrode power input end of the electronic load; the cathode copper bar is used for connecting a cathode power input end of the electronic load, and the cathode copper bar and the anode copper bar are oppositely arranged at an interval; the insulating plate is arranged between the positive electrode copper bar and the negative electrode copper bar, and the positive electrode copper bar and the negative electrode copper bar are tightly attached to one side face of the insulating plate respectively. According to the invention, the amplitude of current overshoot oscillation can be reduced, and the reliability and safety of the parallel operation system of the electronic load are improved.

The invention provides a compact type low parasitic inductance half-bridge packaging structure, which is characterized in that two ends of a main substrate are provided with a positive electrode connecting terminal and an alternating current connecting terminal, a first chip and a second chip are arranged between the two terminals, a positive electrode power electrode of the first chip is electrically connected with the positive electrode connecting terminal, and a negative electrode power electrode of the second chip is electrically connected with the alternating current connecting terminal; a positive power electrode of the second chip is electrically connected with the alternating current connecting terminal, and a negative power electrode of the second chip is electrically connected with the negative terminal; the control substrate is arranged over the two chips in a crossing mode, a first gap bridge connecting piece is arranged on the surface of one side of the control substrate, a negative power electrode of the first chip is electrically connected with the alternating current connecting terminal through the gap bridge connecting piece, and a plurality of grid connecting pieces capable of being electrified with grids of the two chips are arranged on the surface of the other side of the control substrate. The control substrate is arranged above the main substrate, so that the grid electrode of the device is arranged above the space, larger plane space occupied by the grid electrode is reduced, meanwhile, the distance between the grid electrode connecting piece and the chip grid electrode is shortened, and the overall size of the packaging structure is reduced.

The invention discloses a hybrid self-switching bidirectional wireless switched reluctance motor driving system provided and realized by the invention. An independent demagnetization loop is arranged on the motor side, rapid demagnetization is allowed, and energy recovery is achieved. The system wirelessly drives a multi-phase SRM through a single power transfer channel using a single resonant frequency to reduce coupling between multiple power channels. When the WPT system is in forward power, the LCC-S compensation network is adopted to drive the motor load, and the advantage of constant voltage gain when the load changes is achieved; the LCC-LCC / S hybrid self-switching compensation network is adopted to realize charging of a battery load, and has a constant voltage / constant current characteristic; and when the WPT system has negative power, the LCC-LCC compensation network is adopted to realize reverse recovery of energy, and energy interconnection between the motor and the power grid is realized. In addition, an SR motor does not need to be specially designed, and the system has the remarkable advantages of phase current balance, flexible transmission distance, high integration level, maintenance-free property and the like.

A module system (20) includes a safety module (32) and an external output module (36). The external output module has: a first positive input terminal (170a) electrically connected to a positive electrode (26p) of a power supply (26); a negative input terminal (180) electrically connected to a negative electrode (26n) of the power supply; a positive power supply terminal (176) electrically connected to the first positive input terminal and electrically connectable to an external device (22); and a negative power supply terminal (186) electrically connected to the negative input terminal and electrically connectable to the external device.

The utility model belongs to the technical field of electronic circuits, and discloses a simple circuit capable of generating negative precision voltage reference and resisting high temperature of 200 DEG C. The simple circuit comprises a positive reference voltage source U1, a capacitor C1 and an operational amplifier U2, the output end of the positive reference voltage source U1 is connected to the inverted input end of the operational amplifier U2 through the isolation resistor R, the input end of the positive reference voltage source U1 is connected to a VCC power supply, and the GND pin of the positive reference voltage source U1 is connected to the output end of the operational amplifier U2; a pin 3 of the positive reference voltage source U1 is connected to a VCC power supply; a pin 3 of the positive input end of the operational amplifier U2 is grounded, and a pin 2 of the operational amplifier U2 is connected with a negative power supply; the two ends of the capacitor C1 are connected with the floating ground end of the positive reference voltage source U1 and the output end of the positive reference voltage source U1. According to the utility model, fewer components are used, and the precision is higher; the circuit has flexibility, and different negative precision voltage references can be generated by selecting different reference voltage sources and amplifier combinations; and the negative voltage reference generated by the module at the high temperature of 200 DEG C still has very good temperature stability.

The invention discloses a PID test system of a photovoltaic module. The photovoltaic module comprises a positive electrode end, a negative electrode end and an outer frame end. The PID test system of the photovoltaic module comprises an irradiance acquisition module, a power supply module and a controller, wherein the irradiance acquisition module is used for acquiring outdoor light irradiance received by the photovoltaic module; the power module comprises a positive power supply end and a negative power supply end; the anode power supply end is electrically connected with the anode end, and the cathode power supply end is electrically connected with the outer frame end; the power module is used for providing power signals; the controller is electrically connected with the irradiance acquisition module and the power supply module respectively; and the controller is used for controlling the power supply module to output a power supply signal according to the outdoor light irradiance. According to the technical scheme of the invention, the authenticity and reliability of the PID test can be improved, and the reference of the PID test system to the test result of power attenuation can be improved.

The invention relates to the technical field of integrated circuits, and discloses a substrate bias effect resistant CMOS electronic relay control method and system. The method comprises the following steps: constructing an electronic relay circuit by adopting a P-type substrate high-voltage CMOS (Complementary Metal-Oxide-Semiconductor Transistor) process, and connecting a P-type substrate with a negative power supply Vss; the tube body end of the input-stage PMOS is in short circuit with a source electrode and is connected with an intermediate voltage source, and the substrate bias effect is eliminated by using the isolation characteristic; the NMOS tube adopts an asymmetric isolation structure, a body end and a source electrode are short-circuited and connected with a grounding end, and electrical isolation is realized through an N buried layer; the body source short circuit configuration enables the threshold voltage of the input end to be stabilized at the intermediate value between the intermediate voltage source and the grounding end, and does not drift along with the change of the positive power supply Vdd. According to the invention, the problem that the input threshold voltage is unstable due to the substrate bias effect of the PMOS transistor in the existing N-type substrate electronic relay technology is solved, and the control precision and reliability of the electronic relay under different working voltage conditions are improved.

The utility model discloses a string type inverter and a power generation system. The group of serial inverters comprises N paths of MPPT units, N is a positive integer greater than or equal to 3, and each path of MPPT unit comprises a DC / DC module, a positive DC access terminal connected with the DC / DC module through a positive power line and a negative DC access terminal connected with the DC / DC module through a negative power line; the group string type inverter further comprises an RSD transmitter, the RSD transmitter comprises a coupling magnetic core capable of being connected with a fast turn-off signal, the positive power lines of the n paths of MPPT units penetrate through the coupling magnetic core, the negative power lines of the N-n paths of MPPT units penetrate through the coupling magnetic core, and n is a positive integer smaller than N. According to the embodiment of the invention, the emitter with the built-in quick turn-off device can be realized on the direct current side of the inverter at low cost.

Embodiments of the present application provide a display panel, a driving method and a driving module thereof, and a display device. The display panel comprises at least two partitions, at least two first power voltage signal lines and at least two first initialization signal lines. One partition comprises at least one sub-pixel, and the sub-pixel comprises a light emitting element. The first electrodes of the light emitting elements in the at least two partitions are connected to different first initialization signal lines. The second electrodes of the light emitting elements in the at least two partitions are insulated from each other. The second electrodes of the light emitting elements in the at least two partitions are connected to different first power voltage signal lines. The first initialization signal lines are used to transmit first initialization signals for initializing the first electrodes of the light emitting elements. The first power voltage signal lines are used to transmit negative power voltage signals. The embodiments of the present application are beneficial to reducing the initial cross-voltage difference and the brightness difference of the light emitting elements in different partitions.

The utility model discloses a surge current suppression circuit suitable for high-voltage input, which belongs to the technical field of power electronics and comprises an MOS (metal oxide semiconductor) tube, a triode, a first capacitor and a second capacitor. A collector electrode of the triode is connected to a power supply positive electrode line through a resistor, an emitter electrode of the triode is connected to a power supply negative electrode line, a base electrode of the triode is divided into two paths, one path of the base electrode of the triode is connected with a source electrode of the MOS tube through a sixth resistor, and the other path of the base electrode of the triode is connected with a drain electrode of the MOS tube through a fourth resistor; one end of the first capacitor is connected between the second resistor and the first resistor, and the other end of the first capacitor is connected to the power supply cathode line; and the MOS tube is connected to a power supply cathode line. Compared with the prior art, the circuit does not need an auxiliary power supply and an operational amplifier circuit, so that the cost and the arrangement space are saved, the related requirements of GJB181A-2003 on the input current are met, and the power supply and front-end equipment can be protected.

The utility model discloses a power distribution terminal battery management box capable of quickly replacing batteries. The power distribution terminal battery management box comprises an outer box, an inner box, a protection module and a driving module, the outer box comprises a cover plate, a first connecting hole, a second connecting hole, a sliding rail and a pulley; the inner box comprises an inner box handle and a battery mounting box; the protection module comprises an overcurrent protection module, an overheating protection module and a switch; the driving module comprises a driving handle, a connecting rod, a pressing plate and positive and negative electrode contact points; the positive and negative contact points are electrically connected with a wiring terminal, and the wiring terminal passes through the protection module and then leads out a pair of positive and negative power lines to the outside of the outer box; the device adopts a modular wiring structure, can be matched with a power distribution terminal battery for use, improves the working efficiency of on-site battery replacement, reduces short circuit hidden dangers caused by complex battery wiring and the like, and effectively guarantees personal and power grid safety.

This utility model relates to the field of LED lamp color temperature adjustment technology, specifically to a resistive LED lamp color temperature adjustment module, including a positive power input terminal DC+, a negative power input terminal DC-, a DIP switch CN1, a dual-color lamp board, a first resistor network, a second resistor network, a third resistor network, and a fourth resistor network. The positive power input terminal DC+ is connected to the positive terminal of the dual-color lamp board; the negative power input terminal DC- is connected to the DIP switch CN1; the negative terminal of the dual-color lamp board is connected to the DIP switch CN1; the first, second, third, and fourth resistor networks are respectively connected to the DIP switch CN1 and the negative terminal of the dual-color lamp board; the resistance values ​​of the first, second, third, and fourth resistor networks are all different. This module achieves multi-level color temperature adjustment, is simple and reliable in design, easy to produce and maintain, and has low manufacturing costs.

The present invention relates to a flow-electrode capacitive deionization device comprising: a plurality of flow-electrode cartridge units arranged in a first direction, through each of which an electrode fluid flows, and which allow ions to permeate through at least one of both sides in the first direction; raw water flow units respectively coupled, between each pair of adjacent flow-electrode cartridge units in the first direction, to the flow-electrode cartridge units positioned on both sides thereof in the first direction, through which raw water to be deionized flows, and which allows ions to permeate through both sides in the first direction; housings configured to seal, in the first direction, the flow-electrode cartridge units which are respectively arranged at the outermost ends on both sides in the first direction; and a positive power line and a negative power line alternately connected to the plurality of flow-electrode cartridge units in the first direction so that the plurality of flow-electrode cartridge units alternately form positive-electrode flow-electrode cartridge units and negative-electrode flow-electrode cartridge units in the first direction, wherein, when power is applied through the positive power line and the negative power line, negative ions in the raw water flowing through each of the raw water flow units move into the electrode fluid in the positive-electrode flow-electrode cartridge units, and positive ions in the raw water flowing through each of the raw water flow units move into the electrode fluid in the negative-electrode flow-electrode cartridge units.

The application belongs to the technical field of integrated circuits, and specifically discloses a digital control programmable gain amplifier chip, which adopts an SIP packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, an alternating current signal is input from the Vin end, is connected to the inverting input end of the operational amplifier through a capacitor C1 and an input resistor R1, a positive power supply pin of the operational amplifier is connected to a positive electrode VDD of a power supply, a negative power supply pin is connected to the ground, a same-phase input end obtains a VDD / 2 direct current bias voltage through a precision resistor voltage dividing network and is connected after low-pass filtering, a high end of the digital potentiometer is connected to the Vout end, a low end is connected to the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The operational amplifier and the digital potentiometer are integrated, high integration and modularization of the programmable gain amplification circuit are realized, and the problems of insufficient gain precision, decreased reliability of a multi-element system and large circuit volume caused by the on-resistance of an analog switch in a traditional discrete scheme are solved.

This application provides a relay driving circuit and a charging device. In the relay driving circuit, the cathode of a first diode is used to receive a preset positive voltage signal, and the cathode of a second diode is used to receive a preset negative voltage signal. The anodes of the first and second diodes are connected. One end of a first charging circuit is connected to the cathode of the first diode, and the other end is connected to the anode of the first diode. The output terminal is connected to the input terminal of a first comparison unit. The positive and negative power supply terminals of the first comparison unit are respectively connected to the cathode and anode of the first diode. One end of a second charging circuit is connected to the cathode of the second diode, and the other end is connected to the anode of the second diode. The output terminal is connected to the input terminal of a second comparison unit. The positive and negative power supply terminals of the second comparison unit are respectively connected to the cathode and anode of the second diode. The output terminals of the first and second driving modules are respectively connected to two terminals on the coil of the relay to be controlled.

Provided in the embodiments of the present application is a megawatt parallel pipe type charging pile cable, specifically: the cable comprises a sheath assembly, a main power line, cooling pipes and core wires; wherein the cooling pipes are at least 4 in number; the sheath assembly covers the main power line, the cooling pipes and the core wires; the cooling pipes are arranged in close contact with the sheath assembly, and the cable is centrally provided with the core wires; the cooling pipes are distributed at equal intervals; the main power line comprises positive power lines and negative power lines, and the positive power lines and the negative power lines are arranged in one-to-one correspondence and symmetry; the positive power lines and the corresponding negative power lines are arranged in close contact with different cooling pipes, respectively. The present application adopts a multi-core split design for the main power line comprising positive power lines and negative power lines, each independent core wire is closely attached to the outer wall of the cooling pipe, heat conduction is strengthened through direct contact, and heat is efficiently transferred vertically to the cooling liquid.

The application discloses a power semiconductor module packaging structure. The structure comprises a first heat sink, a first chip module and a second chip module; the first chip module and the second chip module are symmetrically arranged on the two sides of the first heat sink; the first chip module comprises a first substrate, a first power chip, a second power chip, a first positive power input terminal, a first negative power input terminal and a first phase power output terminal; the second chip module comprises a second substrate, a third power chip, a fourth power chip, a second positive power input terminal, a second negative power input terminal and a second phase power output terminal; the first substrate, the first power chip, the second power chip, the first positive power input terminal, the first negative power output terminal and the first phase power output terminal are symmetrically arranged with the second substrate, the fourth power chip, the third power chip, the second negative power input terminal, the second positive power output terminal and the second phase power output terminal, so that the commutation paths are completely overlapped.

The invention discloses a test circuit, a surge elimination circuit and a surge elimination method. The surge elimination circuit is coupled between the positive power supply end and the negative power supply end of the test circuit. The surge cancellation circuit includes an impedance element and a first relay switch. The first relay switch is connected in parallel with the impedance element. When the test circuit stops supplying power, the first relay switch is turned on to form a first discharge path. The first discharge path is used for discharging a discharge current generated by the test circuit due to the back electromotive force. After discharging through the first discharge path for a first time, the first relay switch is turned off, and the impedance element forms a second discharge path. Therefore, the surge can be eliminated.

The utility model discloses a garlic cutting device based on garlic tip / root identification, which belongs to the technical field of garlic planting equipment, and comprises a cutting device, a single board computer, a relay, an A / D converter, an air compressor and an SD card, the cutting device comprises a support plate, a power supply device, a control device, a driving device, a camera device, a garlic falling device, a turnover device and a seeding device; the single board computer comprises a mainboard, a USB interface, a GPIO output signal pin, a memory card slot, a power interface, an SCL pin and an SDA pin. The relay comprises a power supply anode interface, a power supply cathode interface, a signal end interface, a normally open interface, a normally closed interface and a common interface. The A / D converter comprises a power supply anode pin, a ground wire pin, an SDA pin, an SCL pin and an analog signal input pin. According to the utility model, the garlic planting efficiency and yield are improved by identifying the orientation of the garlic and adjusting the position of the garlic.

The utility model discloses an embedded host for a chemical analysis instrument in a laboratory, which belongs to the technical field of chemical laboratories and comprises a touch screen, a circuit board, an external interface and a power supply, the host is connected with a control unit of the chemical analysis instrument through an internet access 1 and is communicated with a laboratory server through an internet access 2, and the external interface is connected with the power supply. The host adopts a uniform 24V power supply module to supply power through a needle-shaped or hole-shaped circular connector, PIN serial number output is 1: + VO (positive power supply), 2:-VO (negative power supply), 3:-VO (negative power supply) and 4: + VO (positive power supply), a touch screen interface module is arranged on the circuit board and used for connecting a touch screen, a WIFI / Bluetooth module and a 4G / 5G module provide a wireless communication function, a serial port communication module supports an RS232 or RS485 interface, and a USB interface is arranged on the circuit board. The USB communication module 1 and the USB communication module 2 are respectively used for printing, communication expansion and program upgrading. According to the utility model, different types of chemical analysis instruments can be controlled by installing different embedded software.

The invention relates to an LED constant-current lighting system of an industrial endoscope and the industrial endoscope. The LED constant-current lighting system comprises a microcontroller unit, a digital-to-analog converter, an LED lamp, a switch type constant-current driving module, a low-dropout linear voltage regulator, a differential sampling operation unit and a charge pump converter, wherein the switch type constant-current driving module, the low-dropout linear voltage regulator, the differential sampling operation unit and the charge pump converter are respectively connected with a power supply; the microcontroller unit is connected with the digital-to-analog converter through an I2C communication bus; the digital-to-analog converter is connected with the constant-current driving module; the constant current driving module is connected with the anode of the LED lamp, and the cathode of the LED lamp is directly grounded; the low dropout regulator is respectively connected with the microcontroller unit and the digital-to-analog converter, and the differential sampling operation unit is connected in series between the constant current output end and the LED lamp; the charge pump converter provides a negative power supply for the differential sampling operation unit; meanwhile, the invention discloses an endoscope adopting the system. According to the invention, stable, stroboflash-free, color-fidelity and intelligently adjustable illumination can be provided for the industrial endoscope.

In order to control charging and discharging of an electrochemical storage device, a battery management system (BMS) and a corresponding method have battery monitoring and control circuitry, input and communication ports for sensor inputs and for communication with an external charging power source. Positive and negative power connections connect the electrochemical storage device and the external charging power source, with a disconnect switch in at least one of the power connections. The BMS has an input for an external voltage source to provide an alternative voltage source for the battery management system. A selection circuit selectively connects one of the power connections and the external voltage source to the battery monitoring and control circuit and actuates the disconnect switch.

Embodiments of the present disclosure provide a driving backboard, a light-emitting substrate and a display device thereof, and relate to the technical field of display, which is used to reduce development cost and improve production yield. The driving backboard comprises a substrate, a driving circuit layer and a second conductive layer. The driving circuit layer is arranged on one side of the substrate. The driving circuit layer comprises a transistor, and the transistor comprises a channel portion, a first electrode, a second electrode and a control electrode. The driving circuit layer further comprises a first conductive layer, and the first electrode and the second electrode are located on the first conductive layer. The second conductive layer is arranged on the side of the driving circuit layer away from the substrate. The second conductive layer comprises a positive power line and a negative power line arranged at intervals, the positive power line is configured to be electrically connected to the positive electrode of a power supply, and the negative power line is configured to be electrically connected to the negative electrode of the power supply. The thickness of the second conductive layer is greater than the thickness of the first conductive layer. The driving backboard is used to drive a light-emitting device.

The invention belongs to the technical field of power supply circuits, and particularly relates to a four-quadrant direct-current linear adjustable power supply device and a working method thereof.The four-quadrant direct-current linear adjustable power supply device comprises a linear amplification circuit, a positive power supply selection circuit, a positive power supply adjustment circuit, a negative power supply selection circuit, a negative power supply adjustment circuit and an output stage circuit; an input signal is amplified to the output stage circuit through the linear amplification circuit, so that the positive power supply selection circuit outputs a corresponding adjustable positive voltage to a load through the positive power supply adjustment circuit and the output stage circuit, or the input signal is amplified to the output stage circuit through the linear amplification circuit; the negative power supply selection circuit outputs a corresponding adjustable negative voltage to a load through the negative power supply adjustment circuit and the output stage circuit; adjustable input positive voltage and input negative voltage can be obtained, meanwhile, the linear amplification circuit is matched with the output stage circuit to achieve linear continuous adjustable output within the range of + / -210V, and the wide-range, high-precision and four-quadrant working capacity is achieved.

The invention discloses a high-precision signal conditioning sampling circuit applied to a strain sensor, and the circuit is characterized in that a high-precision reference voltage source module is connected with a positive power supply and the strain sensor, and provides constant-voltage excitation for the strain sensor; the input end of the charge pump module is connected with a positive power supply and is converted into a negative power supply for output; the signal input end of the signal amplification module is connected with the strain sensor, and the signal amplification module is connected with a positive power supply and a negative power supply output by the charge pump module and is used for amplifying differential signals in a dual-power supply environment; the second-order filtering module is connected with the output end of the signal amplification module to filter noise signals; the A / D conversion module is connected with the output end of the second-order filtering module and converts analog signals into digital signals. A dual-power-supply environment is constructed through the charge pump module, so that the signal amplification module can work under a real dual-power-supply rail. And the problem of'zero dead zone 'or nonlinear distortion caused by common output swing limitation of a single-power operational amplifier is thoroughly eliminated.

A transparent screen based on a semiconductor metal transparent wire transparent screen comprehensive manufacturing technology comprises a base material, a positive electrode power line, a negative electrode power line, a signal line and a display unit, more than one display unit installation position is arranged on the base material, and the positive electrode power line, the negative electrode power line and the signal line are arranged on the base material. The positive power supply end of each display unit installation position is connected with the positive power line, the negative power supply end of each display unit installation position is connected with the negative power line, the signal end of each display unit installation position is connected with the signal end of the adjacent display unit installation position through a signal line, and the display units are installed at the display unit installation positions. According to the utility model, the chips can realize a bidirectional control data transmission function through head-to-tail connection, when one chip is damaged, the transmission path of control data can be changed, data is transmitted from a standby end, and normal transmission is ensured. Moreover, a parallel power supply mode is adopted, so that the problem that the overall brightness is not uniform enough can be solved.