6 results about "Zero temperature coefficient" patented technology

This invention discloses an air conditioning device that determines the initial and equilibrium temperatures of a power module; controls the compressor's operating state to ensure the IGBT output current has a relative zero temperature coefficient; determines the total power module losses at the equilibrium temperature based on the IGBT's relative zero temperature coefficient parameters; acquires the thermal resistance of the inverter driver and refrigerant radiator, and determines the theoretical temperature based on the thermal resistance and total losses; determines the theoretical temperature rise based on the theoretical and initial temperatures, and determines the measured temperature rise based on the equilibrium and initial temperatures; determines the deviation value based on the theoretical and measured temperature rises; acquires the standard deviation value, and compares the deviation value with the standard deviation value to determine whether the refrigerant radiator is qualified. The air conditioning device can intelligently assess the reliability of the refrigerant radiator and its installation.

This invention provides a soft-start circuit, relating to the field of electronic and electrical technology. It includes a constant current source module that outputs a zero-temperature coefficient nA-level constant current; a constant current charging module that linearly charges a soft-start capacitor with a constant current, generating a linearly rising soft-start reference voltage; a feedback control module that clamps the output sampling voltage to the reference voltage through a negative feedback loop, ensuring a smooth rise in output voltage; a low-power logic control module that shuts down the constant current charging and feedback control modules after soft-start; and a gate drive module that drives the power devices to conduct. The advantages include using a zero-temperature coefficient nA-level current combined with negative feedback clamping to solve the problems of temperature drift, unstable charging slope, and low control accuracy in traditional RC structures; shutting down related modules after soft-start, combined with a low-current design to reduce static power consumption; and the ability to integrate the circuit on a standard process chip without external components, reducing system size and cost.

This invention discloses a frequency converter driver testing device that determines the initial temperature and equilibrium temperature of a power module; determines the total power module loss at the equilibrium temperature based on the IGBT's relative zero temperature coefficient parameters, current, and voltage; obtains the frequency converter driver's thermal resistance and determines the theoretical temperature based on the thermal resistance and total loss; determines the theoretical temperature rise based on the theoretical temperature and initial temperature, and determines the measured temperature rise based on the equilibrium temperature and initial temperature; determines the deviation value based on the theoretical temperature rise and measured temperature rise; obtains the standard deviation value, and compares the deviation value with the standard deviation value to determine whether the heat sink and power module assembly is qualified. The testing device determines the deviation value by comparing the theoretical temperature change estimated from the power module loss under a specific state and the thermal resistance with the actual temperature change of the power module, and compares this deviation value with a pre-determined standard deviation value to determine whether the heat sink and power module assembly is qualified. This allows for intelligent assessment of the reliability of the power module and heat sink installation.

The application discloses a high-precision voltage stabilizing source circuit with zero temperature coefficient, and relates to the field of voltage stabilizing source circuits.The method comprises a voltage stabilizing unit, a first current source unit and a second current source unit which are adaptively connected.The first current source unit is used for generating a first current I1 with a positive temperature coefficient, and the second current source unit is used for generating a second current I2 with a negative temperature coefficient.Based on the first current I1, the second current I2 and element parameters of the voltage stabilizing unit, the voltage stabilizing unit generates a reference voltage VREF with zero temperature coefficient.The voltage stabilizing source circuit has zero temperature coefficient and higher output precision.

This invention provides a porous carbon-based nanocomposite material with intrinsically zero temperature coefficient, its preparation method, and a flexible pressure sensor with intrinsically zero temperature coefficient, belonging to the field of flexible pressure-sensitive materials technology. This invention uses PDMS as a flexible matrix and carbon black and carbon nanotubes as conductive fillers. It innovatively constructs a uniform and controllable pore structure within the material through a chemical foaming method that generates gas by the in-situ reaction of sodium bicarbonate and hydrochloric acid. Unlike existing technologies that rely on circuit compensation, this invention achieves precise cancellation of the positive and negative temperature coefficient effects of the material over a wide temperature range by synergistically controlling the ratio of carbon black to carbon nanotubes and the porosity of the material, thus obtaining a porous carbon-based nanocomposite material with intrinsically zero temperature coefficient. The preparation temperature and energy consumption are low, the process is simple and controllable, and the relative change rate of the material's resistance is less than 2% in the range of 25~100℃. When used in a flexible pressure sensor, it does not rely on external compensation circuits and exhibits both excellent piezoresistive sensitivity and temperature stability.

A circuit for providing temperature compensation to sense signals in a single-ended DC resistance (DCR) sensing network for a multiphase switching power supply includes a temperature compensation calculator circuit generating a compensation adjust signal indicative of a sensed temperature; a compensating impedance network receiving the positive sense signals for all the phases and generating a correction signal for each phase in response to at least the positive sense signal for each phase and the compensation adjust signal; an average circuit coupled to average the correction signals of all phases, where copies of the average correction signal are applied to modify the positive sense signals; and an amplifier circuit receiving a summed positive sense signal being the sum of the modified positive sense signals for all the phases and a summed negative sense signal to generate an output signal having substantially zero temperature coefficient over the first frequency range.