4results about "Temperature control using analogue comparing device" patented technology

To provide a high efficiency and low noise power source and an inspection device.SOLUTION: A power source that supplies power to a heating mechanism used to heat a measurement target that emits a measurement signal includes an input unit that inputs an input signal obtained by reflecting a control signal in a differentiable periodic waveform with a frequency of 1 kHz or less, and a switching amplification unit that amplifies the signal input from the input unit with a switching circuit and outputs the signal.SELECTED DRAWING: Figure 4

The embodiment of the invention relates to the technical field of geothermal well temperature control, and provides a geothermal well temperature gradient control method and system and a medium, and the method comprises the steps that multi-source monitoring data of a target geothermal well are acquired, and the multi-source monitoring data comprise pressure data and temperature data; based on the multi-source monitoring data, a temperature gradient reference curve of the target geothermal well in the depth direction of a shaft is drawn up; based on the multi-source monitoring data and the three-dimensional point cloud data of the target geothermal well, constructing a geothermal well heat transfer model of the target geothermal well by using a heat transfer dynamics principle; and dividing the target geothermal well into a plurality of well depth sections along the depth direction of the shaft, and determining a temperature gradient control strategy for the plurality of well depth sections based on the temperature gradient reference curve and the geothermal well heat transfer model. According to the embodiment, the overall heat loss rate of the target geothermal well can be effectively reduced, the temperature gradient control precision is improved, the efficient regulation and control requirements of complex underground working conditions are met, and the operation efficiency and the resource utilization rate of the geothermal well are improved.

A temperature control system for a hot surface igniter, the system including: a power source module, for providing energy of the system; a driving module, for outputting a voltage to the hot surface igniter; a collection module, for sampling a thermoelectric signal of the hot surface igniter; a feedback module, for receiving the thermoelectric signal, receiving a voltage control quantity calculated according to the thermoelectric signal, and then performing feedback; and a control module, for receiving the voltage control quantity that is fed back and controlling the output of the power source module according to the voltage control quantity. The present disclosure can enable the hot surface igniter to receive a suitable voltage to ensure that the hot surface igniter operates at a set target temperature, thereby realizing precise control over the operating temperature of the hot surface igniter, and increasing the service life of the hot surface igniter.

Device comprising: an active device (15) with a first connection (30); a first bias resistor (35) connected to the first terminal and a second bias resistor (37) connected in series with the first bias resistor; and a first resistor (40) with a first phase transition material connected in parallel with the first bias resistor, wherein the first phase transition material has a first phase with low conductivity for temperatures below a first phase transition temperature and a first phase with high conductivity for temperatures above the first phase transition temperature; a second resistor (42) comprising a second phase transition material connected in parallel with the second bias resistor, wherein the second phase transition material has a second phase with low conductivity for temperatures below a second phase transition temperature and a second phase with high conductivity for temperatures above the second phase transition temperature.