30results about How to "Stable temperature coefficient" patented technology

The invention provides a surge protection circuit and a chip, comprising: a power tube, which is arranged between the input terminal and the ground voltage; a multi-level control branch, which is arranged between the input terminal and the ground voltage, and the latter-level control branch is connected to The control terminal of the upper-level control branch provides control voltage to the upper-level control branch when the latter-level control branch is turned on, and determines whether the upper-level control branch is turned on; the first-level control branch is connected to the power tube The control terminal of the power tube provides the first control voltage to the power tube when the first-stage control branch is turned on to determine whether the power tube is turned on; the voltage dividing branch is set between the input terminal and the control terminal of the power tube, and is connected to the last The first-stage control branch generates a divided voltage based on the input voltage of the input terminal and the first control voltage of the control terminal of the power tube, and provides it to the last-stage control branch to determine whether the last-stage control branch is turned on. The temperature coefficient of the VIN clamping voltage of the circuit is stable, the clamping voltage can be adjusted continuously, and the surge tolerance is strong.

The invention discloses a strontium-bismuth-titanium-based energy storage medium material for medium temperature sintering and a preparation method, comprising a base material, a modifier and a sintering aid; the base material is SrO-xBi 2 O 3 ‑(1+3x)TiO 2 , 0.04≤x≤0.11; the modifier includes MnCO 3 , Mg(OH) 2 , Co 2 O 3 , and SrZrO 3 , CeO 2 and Y 2 O 3 One or more of them; sintering aids include H 3 BO 3 , ZnO, CaCO 3 and SiO 2 two or more of them. The invention adopts the solid phase method to prepare SrO-xBi 2 O 3 ‑(1+3x)TiO 2 Base material, by adding modifiers and sintering aids, an energy storage medium with high dielectric constant, breakdown strength and insulation resistivity, low loss and sintering temperature, and a stable and adjustable temperature coefficient can be obtained Material.

The invention provides microwave dielectric ceramic powder and a preparation method thereof and relates to the field of electronic information materials and elements. The microwave dielectric ceramic powder specifically comprises the following components in percentage by weight: 85-96% of strontium and cobalt doped ZnO-MgO-TiO2 ternary system microwave dielectric material and 4-15% of zinc-barium-boron-silicon fluxing agent. The technical problem to be solved by the invention is to provide the microwave dielectric ceramic powder and the preparation method thereof; and by using the microwave dielectric ceramic powder and the preparation method thereof, the loss is effectively reduced and ceramic can keep excellent dielectric property and have a stable temperature coefficient.

The invention discloses an R-T-B permanent magnet material, a preparation method and an application thereof. The R-T-B is a permanent magnet material, which includes the following components: R': 29.5-33.0wt.%, said R' includes R and Pr, Nd; wherein: said R is except for Pr, Nd Rare earth elements, the content of the Pr ≥ 8.85wt.%, the mass ratio of the Nd and the R' <0.5; N: > 0.05wt.%, and ≤ 4.1wt.%, the N is Ti, Zr or Nb; B: 0.90‑1.2 wt.%; Fe: 62.0‑68.0 wt.%. The present invention uses a formula with high Pr content to prepare a sintered permanent magnet product with high coercive force and stable temperature coefficient. The formula of this application can maximize the advantages of Pr and effectively reduce production costs.

The invention provides an atomic gas chamber of a compound eye-type stacked dense multi-bubble structure. The atomic gas chamber comprises a glass shell and a filled medium, a plurality of micro-atomic air bubbles configured by glass walls are also arranged in the glass shell, and the micro-atomic air bubbles are filled with alkali metal atoms and a buffer gas. The atomic gas chamber of the compound eye-type stacked dense multi-bubble structure provided by the invention can stabilize the temperature coefficient and suppress the frequency shift, and solve the constrain of the bubble-type germanium atomic frequency standard and the rubidium atomic magnetometer on the long-term frequency stability index due to the changes of the temperature and pressure of the atomic chamber, thereby solvingthe problem of long-term frequency drift. The technical scheme of the invention provides atomic gas chambers with lower temperature coefficients, temperature fluctuation and less pressure shift for applications requiring higher demands such as atomic clocks, atomic magnetometers, atomic filters, and Faraday active light clocks, etc.