11results about How to "Avoid working abnormally" patented technology

This invention discloses a switching converter and its control circuit and method. The mode switching circuit in the control circuit includes: a first detection module for comparing a loop error signal with a set first reference signal to generate a first enable signal; a second detection module for detecting the system duty cycle and, when the system duty cycle is greater than a set duty cycle, comparing the peak inductor current in the switching converter with a preset peak current to generate a second enable signal; and a switching control module for controlling the switching converter to switch from the normal operating mode to the light-load operating mode when either the first enable signal or the second enable signal is valid. By employing a combination of two detection modes, the light and heavy load conditions of the switching converter can be more accurately determined, thereby avoiding abnormal operation of the switching converter due to misjudgment, ensuring that the system can still enter the light-load operating mode under a large duty cycle, and improving the stability and reliability of the switching converter.

The invention belongs to the technical field of liquid detection, and discloses a liquid detection circuit, a detection meter and a detection method.The detection circuit comprises a detection electrode P1, an oscillation unit and a control unit; the oscillation unit comprises an analog switch U1, and the analog switch U1 is connected with the detection electrode P1 and can be switched into a first oscillation mode or a second oscillation mode; the control unit comprises a main control chip U1, and the main control chip U1 is connected with the oscillation unit and used for generating a control signal to switch the oscillation mode of the oscillation unit and calculating the conductivity of the liquid to be measured according to the first oscillation frequency and the second oscillation frequency obtained through measurement. Through a reference-measurement dual-mode frequency measurement and difference calculation method, the influence of factors such as distributed capacitance and electrode contact difference on a measurement result is fundamentally eliminated, meanwhile, measurement failure caused by signal saturation in a high-concentration solution is avoided, and the measurement consistency can be kept in a wide concentration range of 0-164000 PPM.

The invention discloses a double-chip packaging structure based on a double-sided chip-on-film, and belongs to the field of semiconductor packaging, the double-chip packaging structure based on the double-sided chip-on-film comprises a chip-on-film (Tape), double chips, a copper through hole, a circuit layer, a solder mask layer and a glue sealing area, the chip-on-film is of a multi-layer composite structure and comprises a base material, a conductive layer, an insulating layer and an interlayer adhesive, the base material is a thermoplastic PI material; a through hole is formed in the base material, and the manufacturing process of the through hole comprises the steps of forming the through hole through laser processing, coarsening the wall surface of the through hole through plasma etching, forming a copper wall on the wall surface of the through hole through a chemical plating process, and filling copper through a plating process to form the copper through hole; the double chips are inversely packaged on the chip on film through a wafer bump; through the double-sided circuit design, the circuit layout space is doubled, the problem of dense circuits of multi-IC packaging is solved, the manufacturing difficulty and the short circuit risk are reduced, and meanwhile the production cost is reduced.

The invention discloses a water pump PWM software control method for an instant heating type water dispenser and a corresponding medium and equipment, and the method comprises the steps: S1, receiving a water outlet instruction, and judging whether a water pump PWM historical value corresponding to the current target temperature exists or not; s2, if not, a water pump and a heater are started, the PWM value of the water pump is dynamically adjusted through a PID algorithm according to the difference value between the outlet water temperature and the target temperature till the water temperature stably reaches the standard, and the PWM value is stored as a historical value; s3, if yes, the historical PWM value is directly called to control a water pump and start a heater; and S4, continuously monitoring the water temperature in the quick starting process, and if the water temperature deviates from the target temperature, correcting the historical PWM value to keep the constant temperature. According to the invention, rapid starting is realized by storing and calling the historical PWM value, and time consumed by real-time calculation is reduced; closed-loop control is formed by combining monitoring and correction, long-term stability of the water temperature is guaranteed, and the system adapts to environment and equipment state changes.

The liquid crystal phase shifter, liquid crystal phased array antenna, and driving method provided in this invention include: a plurality of liquid crystal phase shifter units, each configured to connect a data signal line to a first node in response to a first scan signal on a first scan signal line; and a first driving circuit electrically connected to the first scan signal line, configured to output a first scan signal in response to signals from a reference signal terminal and an output enable signal terminal, and to control the first scan signal to slowly switch from a first level to a second level. This allows for large-scale driving of multiple liquid crystal phase shifter units, significantly improving driving capability and reducing the difficulty of the bonding process, thereby improving the reliability and stability of bonding. Furthermore, it enhances the stability of the liquid crystal phase shifter units, preventing abnormal operation due to leakage current, thus improving the performance of the liquid crystal phase shifter.

The invention relates to the technical field of traffic control boxes, in particular to a traffic control modular intelligent case and a control method and system thereof. The method comprises the following steps: monitoring various state parameters and environmental parameters of the case in real time, wherein the state parameters comprise a physical safety state and an electrical state; when it is monitored that the state parameters are abnormal, alarm information is generated; sending the alarm information to a monitoring platform through a selected communication mode; according to the monitored temperature and / or humidity state, an environment adjusting device is controlled to adjust the temperature and / or humidity in the case; and when the commercial power is cut off, the standby power supply is automatically switched. The system comprises a case body, a plurality of functional units freely matched on a standard guide rail, a lightning protection device and a temperature adjusting device. According to the invention, comprehensive intelligent monitoring and active operation and maintenance of the case state are realized, and the reliability, the safety and the maintainability of the traffic control system are obviously improved.

The utility model relates to a kind of multi-fuel automatic switching device and engine, comprising: carburetor, pressure reducing valve and control module, the control module includes negative pressure switch solenoid valve, pressure sensor, controller and oil circuit switch solenoid valve, the negative pressure switch solenoid valve with the pressure sensor is set on the pressure reducing valve, the negative pressure switch solenoid valve is connected and controls the on-off of the air inlet, the oil circuit switch solenoid valve is set on the oil inlet pipe of carburetor, the oil circuit switch solenoid valve is connected and controls the on-off of the oil inlet pipe;The controller is according to the gas pressure data of the air inlet control the negative pressure switch solenoid valve, the oil circuit switch solenoid valve.Distinguish prior art, the utility model can avoid gas fuel into carburetor, avoid appearing oil-gas mixed combustion, lead to the situation of engine work not normal appears.

The embodiment of the present application provides a kind of concentration control system of refrigerant water of air conditioner.The system includes: controller, dosing pump, medicine tank, refrigerant water pipeline, refrigerant evaporator and at least one sensor;Medicine tank is provided with refrigerant, and medicine tank is connected with refrigerant water pipeline;Dosing pump is connected with controller, for opening in response to dosing instruction sent by controller;Controller is connected with at least one sensor;Each sensor is arranged in the inside of refrigerant water pipeline;Controller is used to obtain the refrigerant concentration measured by at least one sensor;If it is determined that the refrigerant concentration is less than the first preset concentration value, generate dosing instruction, and send to dosing pump;Refrigerant water pipeline is connected with refrigerant evaporator, and refrigerant water in refrigerant evaporator exchanges heat with refrigerant of air conditioner.The system is used to achieve the effect of automatic monitoring and control of the refrigerant concentration of refrigerant water of air conditioner, improve the control efficiency of the concentration of refrigerant water of air conditioner.

This invention discloses a circuit structure for ESD protection of an LCD, including an LCD module and a circuit board electrically connected to the LCD module. The circuit board includes a reset potential stabilization unit electrically connected to the RES reset pin of the LCD module and a power surge protection unit electrically connected to the power supply terminal. The reset potential stabilization unit and the power surge protection unit cooperate to achieve ESD protection for the LCD. The reset potential stabilization unit includes a pull-up resistor, with its first end electrically connected to the power supply terminal and its second end electrically connected to the RES reset pin. The power surge protection unit includes at least one TVS diode connected in parallel between the power supply terminal and ground. This invention can stabilize the RES reset pin level and reduce ESD sensitivity, discharge ESD surges at the power supply terminal, and achieve ESD protection through the cooperation of two units. The circuit is extremely simple and has low modification costs.

The invention discloses a vehicle and a gas system control method and device thereof. A gas system of the vehicle comprises an air compressor, a dryer, a gas storage cylinder and a gas using component which are connected in sequence. The gas system control method comprises the steps that after a vehicle is powered on, the working load rate of an air compressor in a preset time period is obtained; judging whether the working load rate is smaller than or equal to a preset load rate; if yes, the unloading duration when the air compressor is continuously in the unloading state, the environment temperature and the current air pressure in the air storage cylinder are obtained; and according to the unloading duration, the environment temperature and the current air pressure, an icing trigger event of the gas system is determined, and corresponding protection operation is executed according to the icing trigger event. According to the technical scheme, the working stability of the gas system can be improved, and then the running stability and safety of the vehicle are improved.

The application discloses a driving chip power supply circuit and a display device. The driving chip power supply circuit comprises a voltage comparison module connected to a power supply chip, which is used to generate a first voltage level according to a first power supply and a second power supply; a first power supply module connected to the voltage comparison module and receiving the first voltage level; and a second power supply module connected to the voltage comparison module and receiving the first voltage level. The output ends of the first power supply module and the second power supply module are connected to a driving chip. The first voltage level comprises a high voltage level and a low voltage level. The first power supply module and the second power supply module are selectively turned on according to the first voltage level to provide corresponding power supply voltages to the driving chip. The application improves the power supply of the driving chip of the display device and avoids the problem that the voltage backflow causes the abnormal working of the chip.