33results about How to "No external power supply required" patented technology

A design method and circuit for a serial port multi-stage charging and discharging power supply. The method and circuit are designed to charge a dedicated multi-stage charging and discharging circuit by taking power from the micro-current signal source of the serial port to obtain a power supply powered by an instantaneous large current. Under the premise of not affecting the quality of signal communication, solve the problem of self-power supply based on serial port. The micro-signal source includes a 3-wire system that takes power from the TxD terminal of the RS232 port, and obtains charging power through bidirectional rectification and filtering and charge pump reverse polarity. The first-stage power supply is the main power supply, and the second-stage power supply is the backup power supply. , the main power supply is supported by the backup power supply, so that the method and the circuit meet the extreme power supply requirements in the following cases when the power supply current does not exceed 5mA: support Bluetooth devices at +8dB radio transmission, instantaneous current 20mA, communication distance Up to 300 meters, send data every 4 seconds, and the data length supports 255 bytes. In addition, as an option, a long-life battery micro-current power supply is also used to provide display and connector validity monitoring for up to 9.5 years in storage.

The application discloses a fireless outdoor food heating system based on solar catalytic oxidation, which relates to the technical field of solar energy application. The heating system includes a pot body, a methanol-air spray tank, a heat exchanger and a photovoltaic module; the pot body includes a heating chamber for placing food, an annular flue arranged outside the heating chamber, and an Between the catalytic chamber and the spray chamber, the opening of the heating chamber is upward, and the spray chamber is located above the catalytic chamber; a fan is arranged in the spray chamber; the methanol-air spray tank is arranged on the outside of the heating chamber, and the outlets of the methanol-air spray tank are sequentially The spray chamber, the catalytic chamber and the annular flue are connected; the heat exchanger is arranged under the heating chamber and on the side away from the methanol-air spray tank, and the photovoltaic module is arranged outside the annular flue. The photovoltaic module can store electric energy and assist the heat exchanger To heat food, photovoltaic modules can also provide electricity for fans. This application is used to improve the performance of outdoor food heating systems.

The invention discloses a full-duplex energy collection relay transmission method based on the self-interference minimization criterion, comprising: acquiring information received by a destination terminal and a corresponding first signal-to-noise ratio; selecting a receiving antenna and a transmitting antenna of the relay; Obtain the signal received by the relay in the first time slot αT; obtain the signal received by the relay when the source information is transmitted through the relay in the second time slot (1‑α)T; obtain the signal received by the relay in the second time slot (1‑α)T In the slot (1‑α)T, when the source information is transmitted through the relay, the information received by the destination and the corresponding second signal-to-noise ratio; the destination adopts the maximum ratio combining technology to combine the information from the relay and the source, The receiving signal-to-noise ratio of the destination is obtained by summing the first signal-to-noise ratio and the second signal-to-noise ratio; and the instantaneous safety capacity and system throughput of the system are obtained based on the receiving signal-to-noise ratio of the destination. The simultaneous and same-frequency full-duplex technology of the present invention can nearly double the use efficiency of wireless resources, thereby significantly improving system throughput and capacity.

The invention discloses a super-cooled temperature monitoring method based on a shape memory alloy. The method comprises the following steps: 1) taking a shape memory alloy, of which the weight is 10-20 mg and which is in arbitrary shape, as a super-cooled temperature monitoring material; 2) attaching the super-cooled temperature monitoring material directly onto the surface of a monitored product or an internal or external fit position of a package box and then, carrying out super-cooled temperature monitoring; 3) after the monitoring is finished, carrying out analysis on the super-cooled temperature monitoring material through a thermal analysis instrument, and comparing the monitoring result with an original measurement result to obtain information about whether the monitored product is lower than the minimum temperature in the monitoring process and specific temperature exceeding information; and 4) carrying out heating processing on the super-cooled temperature monitoring material until reaching a temperature higher than the austenite transformation finish temperature, so that recycle use of the super-cooled temperature monitoring material can be realized. The super-cooled temperature monitoring method does not need external power supply and can keep history temperature information for a long time.