6results about How to "Use less components" patented technology

The invention relates to a sensing system based on a surface acoustic wave oscillator. The sensing system comprises two resonators, two oscillating circuits, a temperature controller, a fluid pipeline, a frequency mixer, an amplification function comparator and a frequency divider, the temperature controller, the resonators and the oscillating circuits are arranged on the fluid pipeline, the two resonators are located on the upper side and the lower side of the temperature controller respectively, and the two oscillating circuits are located on the upper side and the lower side of the two resonators respectively; the temperature controller transmits heat to the resonators on the upper side and the lower side through the fluid pipeline, the resonators adjust resonant frequencies according to temperature changes and output different frequencies to the adjacent oscillating circuits, and the two oscillating circuits are connected with the frequency mixer. The mixer outputs a difference frequency signal to the amplification function comparator, and the amplification function comparator outputs a square wave signal to the frequency divider.

The present invention provides an LLC power supply input overvoltage protection circuit and an overvoltage protection method, wherein the circuit includes an overvoltage detection circuit, a switch tube off-state voltage equalization circuit, and a control circuit. The circuit is composed of simple components and can accurately and reliably protect the circuit according to the preset threshold value. It can ensure that when the input power supply voltage is twice the limit voltage that the switch tube can withstand, the switch tube will not explode due to overvoltage, so it can be used in ultra-high voltage applications. Using the most basic circuit principles, through ingenious and reasonable design and repeated experimental verification, it is not only extremely reliable, but also one of the simplest and lowest-cost circuit solutions at present.

The invention discloses a system and method for monitoring the pickling environment of pickles, the system comprises a monitoring center and a plurality of monitoring terminals, and each monitoring terminal correspondingly monitors the pickling environment of a pickle jar; the monitoring terminal comprises a microprocessor as well as a temperature sensor, a pH value sensor, a turbidity sensor and a mould sensor which are connected with the microprocessor, the microprocessor is arranged outside the jar body, and the temperature sensor, the pH value sensor, the turbidity sensor and the mould sensor are all arranged in the jar body; the monitoring center comprises a central controller, and the microprocessors of the plurality of monitoring terminals achieve information interaction with the central controller through communication modules. According to the invention, the central controller obtains the health state evaluation coefficient according to the data monitored by the sensor or generates the warning information to be fed back to the user, so that the pickle pickling environment can be comprehensively monitored, and the pickling state can be visually fed back to the user.

The invention discloses an inverter AC output short-circuit protection circuit and an inverter. The inverter AC output short-circuit protection circuit comprises a first voltage-dividing current-limiting module, a second voltage-dividing current-limiting module, a switching diode, an optocoupler and a switching module. When the alternating current output of the inverter is normal, the optocoupler is periodically conducted, the switch module outputs a low level to a controller of the inverter, and the controller controls the inverter to normally work and the alternating current of the inverter to normally output; and when the AC output of the inverter is short-circuited, the optocoupler is disconnected, the switch module outputs a high level to a controller of the inverter, and the controller controls the inverter to stop inversion work and the AC output of the inverter to stop. Therefore, the circuit provided by the invention has the advantages of few used elements and simple structure, can realize the alternating current output short circuit protection of the inverter, and can reduce the damage of the inverter and the electric equipment caused by the short circuit of the electric equipment.

The invention relates to a wireless sensing system for fluid flow detection based on an SAW oscillator. The wireless sensing system comprises a resonator, an oscillating circuit, a heating and temperature sensing module, a temperature stabilizer, a fluid pipeline, a frequency mixer, an amplifier, a signal generator and a comparator. The oscillating circuit, the resonator, the temperature stabilizer and the heating and temperature sensing module are sequentially arranged on the fluid pipeline; the temperature stabilizer transmits heat to the resonator through the fluid pipeline, the resonator adjusts resonant frequency according to temperature changes and outputs the adjusted resonant frequency to the oscillating circuit, the oscillating circuit is connected with the amplifier, the amplifier amplifies the oscillating frequency output by the oscillating circuit and then transmits the amplified oscillating frequency to the frequency mixer, and the signal generator outputs sine wave signals to the frequency mixer. The mixer outputs the difference frequency signal to the comparator. According to the invention, the linear interval of the intermediate frequency signal along with the fluid flow change is improved, the service life of the system test is prolonged, and the null drift stability is improved.

The embodiment of the present application relates to a kind of energy storage device sub-module equivalent simulation method, this method includes the following steps: according to the switching resistance characteristic of switching device, the equivalent model of switching device is established;Energy storage capacitor is discretized, and the equivalent model of energy storage capacitor is established;According to the pre-stored energy storage battery group test data, the equivalent model of energy storage battery group is established;Equivalent voltage and equivalent resistance value of sub-module under different states are calculated;According to the working state of sub-module under different working conditions, each controlled voltage source and controlled resistance are respectively assigned corresponding value.The technical scheme provided by the embodiment of the present application, method implementation is simple, less component is used in model, it is advantageous to improve the simulation efficiency of simulation model.