270 results about "Solid-state relay" patented technology

The invention discloses a power distribution management system of an intelligent charging pile, and belongs to the technical field of electric vehicle charging facilities and intelligent power grids. The load prediction module carries out space-time alignment fusion on historical data and real-time monitoring data to generate a power distribution demand prediction value, and the edge calculation controller executes a model prediction control algorithm based on multi-source data to generate a real-time control strategy containing relay time sequence parameters and a capacitance compensation scheme. And the dynamic power distribution adjustment module executes strategy parameters through the solid-state relay array and the parallel compensation capacitor bank. Self-adaptive adjustment of the power distribution network is achieved through a real-time monitoring-prediction-optimization closed-loop control mechanism, the harmonic content of the power grid is effectively reduced, the energy distribution efficiency of the charging pile group is improved, and the method is suitable for intelligent electric energy management of public charging stations and other scenes.

The invention discloses an automatic multi-channel solid-state relay testing device, and belongs to the technical field of electrical element detection and intelligent manufacturing testing. The device comprises an insulation and voltage resistance test module, a direct current function test module, an alternating current function test module, an automatic load test module and an MES execution management module. The device has the advantages of complete testing functions, high precision, high automation degree, wide adaptation range and the like, and is suitable for delivery inspection and life verification of various solid-state relays.

The invention discloses an intelligent insulation parameter dynamic monitoring and regulation system based on a GD32 microcontroller, and belongs to the field of power electronic insulation monitoring. According to the system, a distributed monitoring network is constructed by taking GD32 as a core processor, a multi-channel time-sharing sampling and dynamic impedance measurement algorithm is integrated, GA / GB dual-channel independent sampling is realized by virtue of a state machine, and the sampling efficiency is improved by 80% compared with that of a traditional scheme. A programmable resistance network and a low-noise operational amplifier are adopted, 1 pF to 100 nF impedance matching and 5-200-time dynamic gain adjustment are achieved, an optical coupler switching dynamic impedance measurement method is originally created, four sets of voltage are adopted for time-sharing conduction of a solid-state relay, and 1.5% high precision is achieved through an improved voltage division model. LC-pi type filtering is adopted at a signal input end, and the high-frequency noise suppression ratio is larger than 20 dB; and a CAN module is newly added, so that a CAN2.0B extension frame and an adjustable Baud rate of 10k-1Mbps are supported. Actual measurement shows that the system can measure 10-65M omega insulation resistance in new energy and rail transit scenes, the dynamic response is smaller than or equal to 200ms, the system is suitable for the fields of medical equipment, industrial sensors and the like, and the overall performance is improved by three times compared with that of a traditional scheme.

The invention discloses an electric aircraft high-voltage power distribution control method and system, a medium and a product thereof, and relates to the technical field of high-voltage power distribution, and the method comprises the steps: receiving a DC power supply outputted by a power battery pack, and achieving the power-on soft start through a pre-charging loop; distributing electric energy to a motor controller, an auxiliary power supply module, an air conditioning system and an electric heating system through a power distribution level according to the load priority; the power distribution stage integrates multiple solid-state relays or contactors to form load branches. An independent protection unit is configured for each load branch at a load output stage, and the independent protection units monitor voltage, current and temperature parameters in real time and execute fault isolation operation when the monitored parameters exceed corresponding preset thresholds. According to the invention, high-voltage power distribution control with load priority scheduling and branch-level rapid fault isolation is realized under the condition of high power density.

The invention discloses a double-layer heating cooperative temperature control structure, which adopts a double-layer structure comprising an outer-layer heating module, an inner-layer heating module and an isolating layer, wherein the outer-layer heating module is used for quickly heating and compensating heat loss through a spirally wound high-power density element; the inner layer heating module is embedded into an experimental object through a net-wound low thermal inertia heater to realize local fine temperature control, and thermal coupling interference between the inner layer heating module and the experimental object is reduced through an aerogel or ceramic fiber isolation layer with the thickness of 5-10 mm. The cooperative temperature control unit integrates fuzzy PID composite control, a self-adaptive robust control algorithm and multi-mode strategy dynamic adjustment, thermal coupling strength is fed back in real time through a heat flow sensor, an outer-layer high-power element and an inner-layer low-thermal-inertia element are controlled in a decoupling mode through a solid-state relay, and a double-ring framework is formed. The problems that a traditional single-layer heating system is large in temperature gradient, low in response speed, high in energy consumption and the like are solved, and the temperature control precision and the energy efficiency ratio are remarkably improved.

The invention discloses a double-range current measurement system based on a solid-state relay, and relates to the technical field of current measurement. The system comprises a closed-loop Hall current sensor, a first shunt resistor, a second shunt resistor, a solid state relay (SSR), a Hall conditioning IC and an external controller. Two shunt resistors with different resistance values are dynamically switched through a solid-state relay, and compatibility of low-current high-precision measurement and high-current wide-range measurement is achieved. The method solves the problems that the precision and range of an existing single-range sensor are difficult to consider, double sensors are high in cost, mechanical relays have defects and the like, has the advantages of low cost, high reliability, good measurement precision and the like, and is suitable for wide-dynamic-range current measurement scenes such as an energy storage system and the like.

The invention discloses a molten salt energy storage device and method based on nitrate, and the device comprises a plurality of resistors, a plurality of MOS tubes, a plurality of operational amplifiers, a plurality of diodes, a triode, a capacitor, a solid-state relay, a potentiometer, and a counter. The output end of an operational amplifier U7 in the plurality of operational amplifiers is connected with five pins of the potentiometer U2, and the anti-phase end inputs a temperature parameter signal IN1; the in-phase end is connected with eight pins of the potentiometer U2 and one end of the resistor R5; the six pins of the potentiometer U2 are connected with one end of a resistor R16 and the drain electrode of a PMOS tube Q2; the grid electrode of the PMOS transistor Q2 is connected with the output end of the operational amplifier U8, and the source electrode is connected with a power supply and meets the positive voltage requirement; the inverting end of the operational amplifier U8 is connected with a reference signal, and the in-phase end of the operational amplifier U8 is connected with the grid electrode of the NMOS tube Q1, one end of the resistor R4 and the collector electrode of the NMOS tube Q1; a base electrode of the triode U1 is connected with one end of the resistor R6; the drain electrode of the NMOS tube Q1 is connected with the other end of the resistor R6, one end of a resistor R7 and four pins of the solid-state relay U3; the other end of the resistor R7 is connected with one end of the capacitor C1.

The application discloses a plug-in electronic normally closed solid-state relay with LED indication and relates to the technical field of solid-state relays, which comprises a protection assembly for protecting the plug-in electronic normally closed solid-state relay; and a first movable plate located at one end of the protection assembly and movably connected with the protection assembly. The application has the beneficial effect that since the second clamping tooth on the dialing shaft is in meshing connection with the third clamping tooth on the left side of the first movable hole in the first linkage disc, a counterclockwise dialing force can be generated on the first linkage disc, the linkage disc is rotated clockwise under the action of the rotating rod, the first linkage disc, the first sleeve, the first sleeve rod and the first movable plate are upwardly deviated, the first movable plate is rotated clockwise with the rotating column as the base point, the gap covered by the bottom of the first movable plate is directly exposed, some slight open-circuit or poor contact conditions can be manually adjusted, and simple maintenance can be realized without completely disassembling the solid-state relay.

This utility model discloses a heat dissipation mechanism for a solid-state relay, including a housing for mounting the relay body, a top cover fixedly connected to the inner wall of the housing, an air inlet and an air outlet on both sides of the housing, an air inlet pipe fixedly connected to one side of the housing corresponding to the air inlet, a filter screen fixedly connected to the inner wall of the air inlet pipe, a support shaft fixedly connected to one side of the housing, a rotating arm rotatably connected to one end of the support shaft, and bristles fixedly connected to the side of the rotating arm near the filter screen. When the bristles rotate to below the air inlet pipe, a movable column contacts a fixed column, and the fixed column presses against the movable column, causing the movable column to move towards the side closer to the filter screen. This compresses a spring and drives a sliding rod to move, which in turn moves a movable plate away from the rotating arm, cleaning the bristles. This allows the heat dissipation mechanism for the solid-state relay to effectively clean the bristles, preventing dust adhering to the bristles from affecting the subsequent cleaning of the filter screen.

The utility model relates to the technical field of optical precision injection molds, and discloses an efficient optical precision injection mold temperature control system which comprises a rectifier and a power line. The direct-current positive and negative rotation solid-state relay is electrically connected to Peltier temperature control equipment through a power line, a heat dissipation device is arranged on the top of the Peltier temperature control equipment, a fixed mold core is arranged outside the Peltier temperature control equipment, and an insert is arranged on the upper portion of the fixed mold core; and one end of the ventilation pipeline is fixedly connected to the output end of the air blower. According to the utility model, the direct current rectified by the rectifier is introduced into the electric copper sheet through the direct current positive and negative rotation solid-state relay, so that the problem of non-uniform product shrinkage due to limited heat transfer performance of water and oil in the prior art and scheme such as water and oil circulation temperature control is solved.

The utility model relates to a remote control device for medical equipment, which comprises a signal transmitting mechanism and a signal receiving mechanism, the signal transmitting mechanism is in wireless signal connection with the signal receiving mechanism, and the signal transmitting mechanism comprises a wireless signal transmitting module and a plurality of pedals. The signal receiving mechanism comprises a wireless signal receiving module and a plurality of signal transmission units, the remote control device for the medical equipment adopts an MOSFET output solid-state relay with an optical coupling isolation function, and then the wireless signal transmitting module of the STR885 model is matched with the wireless signal receiving module of the SRX885 model, so that the remote control device for the medical equipment is realized. According to the relay, on-off control of an external load can be achieved, the relay does not need to consider the voltage matching problem of an original driving circuit, mechanical contact bidirectional conduction is avoided, the adaptability and compatibility are improved, and the practical value is improved.

The application discloses a solid-state relay and a manufacturing method thereof, and comprises the following steps: S1, a power component manufacturing process; S2, a printed board component manufacturing process; S3, combining and packaging the power component manufactured through the step S1 and the printed board component manufactured through the step S2 to form an integral whole; the manufacturing method of the solid-state relay provided by the application improves the production efficiency and reduces the cost by separately processing and combining the power component and the printed board component; the solid-state relay provided by the application is reliable and durable according to the above manufacturing method; the solid-state relay provided by the application is provided with a built-in driving circuit, is suitable for AC power grid terminal control, has reliable performance guarantee, and can effectively reduce the conducted disturbance.

The invention discloses a high-reliability miniature solid-state relay, which comprises a plastic shell, a relay core and a relay core, wherein the plastic shell is formed by injection molding; the integrated power module comprises two silicon carbide (SiC) MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) chips which are connected in parallel, and the chips are connected through a silver sintering technology; the multilayer ceramic substrate is prepared by adopting an LTCC (Low Temperature Co-Fired Ceramic) process and comprises a first insulating layer and a second insulating layer; the invention provides a gel sealing system and a pin assembly. The high-reliability miniature solid-state relay is light in weight, lower in cost and longer in service life. The invention further discloses a manufacturing method of the high-reliability miniature solid-state relay.

This invention discloses a control circuit based on a hybrid switching timing of relays and thyristors. By connecting the thyristor in parallel with the relay, the thyristor bears the load current before and after the relay is closed, thus avoiding contact arcing. The control unit triggers the thyristor at the AC zero-crossing point, reducing switching losses and electromagnetic interference, and combines an RC snubber circuit with optocoupler isolation to improve reliability. This device can increase the relay lifespan from 20,000 cycles to 500,000 cycles, and its cost is only 1 / 3 that of a solid-state relay, making it particularly suitable for soft-start control of high-current inductive loads.

The utility model discloses an automatic temperature control sampling device capable of prolonging system calibration response time. The automatic temperature control sampling device comprises a sampling unit and a temperature control unit, according to the utility model, the pneumatic angle seat valve is introduced at the outlet of the sampling pipe, which is a core component of the sampling unit, and the valve is tightly matched with the sealing ring by driving the telescopic hammer through the cylinder, so that the efficient and reliable cut-off operation of a sampling pipe gas circuit is realized; in the system calibration process, the standard gas is effectively limited to circulate in the device, the problems that the concentration of the standard gas is reduced and the calibration time is prolonged due to gas leakage in a traditional design are solved, and therefore the accuracy and high efficiency of the calibration process are ensured. According to the design of the temperature control unit, the heater is directly arranged outside the cavity in a sleeving mode, and accurate temperature control is achieved through the temperature controller and the solid-state relay. According to the integrated design, the complex installation process that a temperature control box needs to be externally hung or cable leads need to be additionally arranged in a traditional probe is simplified, and the manufacturing cost and the maintenance difficulty are greatly reduced.

The utility model discloses full-automatic temperature detection equipment for a protector, relates to the field of temperature detection equipment, and solves the problems that the reading and recording of temperature values depend on manual operation, so that the detection precision is not high, the detection is easily influenced by human factors, and the working efficiency is high. Comprising a PLC control module, an oil tank control system, a display screen, a transmission mechanism, a detection mechanism, a sorting mechanism, a feeding mechanism, a discharging mechanism, a stirring mechanism and a machine body frame. The oil tank control system consists of a PLC (Programmable Logic Controller), a servo driver, four oil tanks (a low-temperature tank, a high-temperature tank, a low-return tank and a high-return tank), a heating pump solid-state relay and a cooling pump contactor, the four oil tanks are electrically connected with the machine body frame, the PLC controls the servo driver, the equipment replaces manual repeated labor, the labor intensity of workers is reduced, and compared with a manual test process method, the test efficiency is greatly improved. The production efficiency is improved, the unit labor cost is reduced, the quality of the protector is improved, and the market competitiveness of the protector is improved.

1. The name of this design product: solid-state relay (guide rail type). 2. Purpose of this design product: solid-state relay used for control circuits. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1.

The utility model provides an electrode switching device. The electrode switching device comprises a controller, an H-bridge upper tube circuit, an H-bridge lower tube circuit and a solid-state relay, the controller is electrically connected with the solid-state relay; one end of the H-bridge upper tube circuit is connected with the first power supply, and the other end of the H-bridge upper tube circuit is electrically connected with the solid-state relay; one end of the H-bridge lower tube circuit is electrically connected with the H-bridge upper tube circuit, and the other end of the H-bridge lower tube circuit is grounded; the H-bridge upper tube circuit is switched on to switch a positive electrode, and the H-bridge lower tube circuit is switched on to switch a negative electrode; the controller is used for controlling on or off of the solid-state relay; and the solid-state relay is used for switching on or switching off the H-bridge upper tube circuit. The H-bridge upper tube circuit, the H-bridge lower tube circuit and the solid-state relay are integrated on one electrode switching device, the electrode switching device can be directly connected with a direct-current power supply, free switching of the positive electrode and the negative electrode is controlled, the manufacturing cost is low, and the universality of the electrode switching device is also improved.

1. The name of this design product: Radiator. 2. Application of this design product: For use with electronic control components such as solid-state relays. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

Semiconductor relay module, comprising: a first semiconductor relay (10), including a first input circuit (11) and a first output circuit (12); a second semiconductor relay (20), including a second input circuit (21) and a second output circuit (22); a third semiconductor relay (30), including a third input circuit (31) and a third output circuit (32); a fourth semiconductor relay(40), including a fourth input circuit (41) and a fourth output circuit (42); a fifth semiconductor relay (50), including a fifth input circuit (51) and a fifth output circuit (52); a sixth semiconductor relay (60), including a sixth input circuit (61) and a sixth output circuit (52); a package (70) designed to accommodate the first solid-state relay (10), the second solid-state relay (20) and the third solid-state relay (30) in the package (70); a first input terminal (71), a second input terminal (72) and a third input terminal (73) arranged in the package (70), wherein the first input terminal (71), the second input terminal (72) and the third input terminal (73) are each partially exposed to the outside of the package (70); a first output terminal (81), a second output terminal (82), a third output terminal (83), a fourth output terminal (84) and a fifth output terminal (85) arranged in the package (70), wherein the first output terminal (81), the second output terminal (82), the third output terminal (83), the fourth output terminal (84) and the fifth output terminal (85) are each partially exposed to the outside of the package (70); a first connecting line (80) for connecting the first output circuit (12) and the second output circuit (22) in the package (70), a second connecting line (86) for connecting the fourth output circuit (42) and the fifth output circuit (52) in the package (70), wherein the first input circuit (11) is connected to the first input terminal (71) and the second input terminal (72) in the package (70), wherein the second input circuit (21) is connected to the first input terminal (71) and the second input terminal (72) in the package (70), wherein the third input circuit (31) is connected to the first input terminal (71) or the second input terminal (72) in the package (70), wherein the third input circuit (31) is connected to the first input terminal (71) in the package (70), wherein the fourth input circuit (41) is connected to the first input terminal (71) and the second input terminal (72) in the package (70), wherein the fifth input circuit (51) is connected to the first input terminal (71) and the second input terminal (72) in the package (70), wherein the sixth input circuit (61) is connected to the first input terminal (71) or the second input terminal (72) in the package (70), wherein the sixth input circuit (61) is connected to the third input terminal (73) in the package (70), wherein the first output circuit (12) is connected to the first output terminal (81) and the first connecting line (80) in the package (70), wherein the second output circuit (22) is connected to the second output terminal (82) and the first connecting line (80) in the package (70), wherein the third output circuit (32) is connected to the third output terminal (83) and the first connecting line (80) in the package (70), wherein the fourth output circuit (42) is connected to the fourth output terminal (84) and the second connecting line (86) in the package (70), the fifth output circuit (52) is connected to the fifth output terminal (85) and the second connecting line (86) in the package (70); and the sixth output circuit (62) is connected to the third output terminal (83) and the second connecting line (86) in the package (70); wherein in a first state in which current flows through the first input terminal (71) and the second input terminal (72) without flowing through the third input terminal (73), the first output circuit (12) and the second output circuit (22) are designed to be switched on, the third output circuit (32) is designed to be switched off, the first output terminal (81) and the second output terminal (82) are designed to be electrically connected to each other, and the first connecting line (80) and the third output terminal (83) are designed to be electrically disconnected from each other, and wherein in a second state in which current flows through the third input terminal (73) without flowing through the first input terminal (71) and the second input terminal (72), the first output circuit (12) and the second output circuit (22) are designed to be switched off, the third output circuit (32) is designed to be switched on, the first output terminal (81) and the second output terminal (82) are designed to be electrically disconnected from each other, and the first connecting line (80) and the third output terminal (83) are designed to be electrically connected to each other.

1. Name of the designed product: solid-state relay case (recovery). 2. Use of the designed product: used for protecting the circuit board on the solid-state relay. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: front view.

The utility model discloses a combined permanent magnet self-inductance generator motor which is composed of a disc-type stator, a radial stator, a permanent magnet rotor, a power switch control system and a power generation switch control system. The disc type stator generates clockwise torque force on the permanent magnet rotor in the axial magnetic field direction, and the radial stator also generates clockwise torque force on the permanent magnet rotor in the radial magnetic field direction. And electric energy generated by the disc-type stator winding iron core, the radial stator winding iron core and the winding opposite to the permanent magnet rotor due to power-off self-inductance is guided to a battery or other electric equipment by closing the solid-state relay II. Therefore, compared with a single disc type or radial type permanent magnet self-inductance generator motor, the permanent magnet rotor has larger torque force, and the stator winding converts magnetic field energy into electric energy to be output, so that the permanent magnet energy is higher in utilization rate. If the device is installed on an electric automobile, the cruising ability of the electric automobile is greatly improved, and the battery consumption is reduced.

1. Name of the designed product: solid state relay (resettable fuse). 2. Use of the designed product: used in control circuit. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: front view.

The invention relates to an intelligent window power supply control system based on photovoltaic driving, which comprises a main power supply circuit, a standby power supply circuit and a load circuit, and is characterized in that the main power supply circuit comprises a photocell pack, a storage battery pack, a combined socket and a contactor, and the standby power supply circuit comprises a frequently-used power supply, a terminal strip, a fuse, a contact switch, an AC / DC converter and a rectifier diode; the load circuit and the AC / DC converter are arranged in parallel, the load circuit comprises a motor and a solid-state relay, power storage is provided for the storage battery pack through the photocell pack, natural resources are reasonably utilized, and the power consumption cost is saved; a load circuit is assembled on the standby power supply circuit, so that the problems that a power supply is easily influenced by weather factors, so that the circuit is unstable, and an intelligent window system based on photovoltaic driving is easily damaged are solved; the green power connection head of the first combined socket and the green power connection head of the second combined socket are connected with the storage battery pack in parallel and are arranged in a vacant mode, multiple groups of load circuits can be loaded in parallel, and each group of circuit works independently and does not influence each other.

The utility model discloses a direct-current solid-state relay which comprises a mounting plate, a relay shell is arranged on the upper end face of the mounting plate, a protective cover plate is arranged at the upper end of the relay shell, and two friction rotating shafts are symmetrically arranged on the two sides of the outer wall of the protective cover plate. The upper end of the mounting plate is provided with dismounting assemblies located on two sides of the relay shell, each dismounting assembly comprises two positioning seats, a fixing plate and guide plates, the two positioning seats are internally provided with the guide plates, and the relay shell is internally provided with two mounting grooves; the number of the fixing plates is two, the two fixing plates are fixedly installed in the installation groove, the upper end face of the relay shell is provided with an insertion groove, the four corners of the bottom of the protective cover plate are fixedly provided with insertion rods, and one ends of the insertion rods are connected to the insertion groove. The direct-current solid-state relay can be quickly disassembled and assembled, the installation tightness is improved, the relay is effectively protected, and the service life of the relay is prolonged.

A hybrid wireless power device comprises a single coil operated at two or more resonance frequencies. For example, a control circuit controls the voltage applied across a power transmission coil of a hub, and a frequency control circuit comprises a switch, such as a solid state relay, for switching between a first capacitance and a second capacitance for shifting the resonance frequency from a first resonant frequency to a second resonant frequency.

1. The name of the design product: plug-in solid state relay. 2. The use of the design product: for switching on or off power control. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The embodiment of the application provides a kind of battery voltage detection system, it is related to battery technical field.It includes: control end and execution end, control end includes controller and photoelectric coupler;Execution end includes charging power supply, battery, bus, switching element and polarity switching circuit, switching element is solid-state relay or MOS tube;Bus includes first bus and second bus, and polarity switching circuit includes first switching element group and second switching element group;The positive pole of charging power supply is connected with first bus by first switching element group, and the negative pole of charging power supply is connected with second bus by first switching element group;The positive pole of charging power supply is connected with second bus by second switching element group, and the negative pole of charging power supply is connected with first bus by second switching element group, and polarity switching circuit is used to switch the polarity of charging power supply connected by bus.The method of the application effectively solves the problem of higher cost and insufficient control precision of battery voltage detection system in the related art.

The utility model discloses an automatic compounding device of a paper mounting machine, which relates to the technical field of compounding of paper mounting machines and comprises an adjusting mechanism, and a heating mechanism is arranged at the bottom of the adjusting mechanism. The adjusting mechanism comprises a driving assembly and two detection mechanisms. When the paper thickness exceeds a preset range, a driving roller is pressed to move upwards, a sliding piece is driven to compress a reset spring, a piezoresistive sensor is triggered, when the pressure exceeds a threshold value, a system automatically cuts off a power source of a driving motor to stop, an operator inputs the target paper thickness on an intelligent control panel, and the motor drives a threaded rod to rotate; rotary motion is converted into linear motion through a thread pair, the hollow part is driven to slide along the guide rail, the distance between the hollow rolling shaft and the driving rolling shaft is adjusted, and when production is finished or maintenance is carried out, the starting panel supplies power to the heating connecting part through the solid-state relay, a heating pipe in the hollow rolling shaft is activated, a glue layer is heated and softened, and a system is automatically powered off after glue stains are removed through a special scraper.

The invention discloses a solid-state relay circuit with a quick turn-off function in the technical field of integrated circuits, which comprises a photovoltaic generation chip, a light-emitting input module and a first photocell group, and is characterized in that the photovoltaic generation chip comprises a first photocell group; the light-emitting input module comprises a first input control pin INP and a second input control pin INN, and one end of the first input control pin INP is connected with the anode of the light-emitting diode D1. According to the invention, an independent second photocell group which is not limited to two sections is provided for a depletion transistor N1, the transistor N1 can be turned off, meanwhile, a first resistor is used for rapidly discharging a parasitic capacitor which is connected in series with a first photocell and a second photocell and a grid parasitic capacitor of the MOS transistor N1, and a diode D2 and a triode Q1 are arranged, so that the voltage of the transistor N1 is reduced. And the discharge current of the PVG chip can be further improved.