Highly reliable and safe temperature control circuit

Abstract

The invention relates to a highly reliable and safe temperature control circuit which is characterized by comprising a platinum resistor, a signal conditioning circuit, a comparison circuit, a threshold voltage, a first heating switch, an A / D conversion circuit, a processor, a second heating switch and a heating sheet. The platinum resistor is fit to the surface of an inertia sensor in an inertiagroup, and used to collect the temperature of the inertial sensor; the signal conditioning circuit is connected with the platinum resistor; the first and second input ends of the comparison circuit are connected with the signal conditioning circuit and the threshold voltage respectively; the source of the first heating switch is connected with a heating power supply, and the gate of the first heating switch is connected with the output end of the comparison circuit; the A / D conversion circuit is connected with the signal conditioning circuit; the processor is connected with the A / D conversioncircuit; a target temperature is arranged in the processor and compared with a temperature digital signal; the second heating switch is an MOS type switch, the source of the second heating switch is connected with the drain of the first heating switch, and the gate of the second heating switch is connected with the processor; and the heating sheet is arranged in one side of the inertia sensor, andconnected with the drain of the second heating switch.

Description

technical field [0001] The invention is designed in the field of temperature control, in particular a temperature control circuit used for the inertial measurement combination of a launch vehicle. Background technique [0002] The working environment of the launch vehicle at high altitude is relatively harsh, and the temperature changes drastically. In order to ensure the navigation accuracy of the inertial group and reduce the influence of the external temperature environment on the inertial group, the temperature control circuit must be used in the inertial measurement combination accordingly. [0003] At present, the commonly used temperature control circuit on the market uses the temperature sensor to collect the internal temperature of the inertial group, and the control module detects the difference between the internal temperature and the target temperature, performs PID calculation, and generates a corresponding PWM voltage signal on this basis, controls the heating ...

AI Technical Summary

Problems solved by technology

From the perspective of safety, this kind of temperature control circuit is unqualified, and the following two situations will cause the launch mission to fail: (1) The core control module may cause continuous heating due to software design errors or single-event locking problems, Finally, the inertia sensor in the inertial group is burned; (2) the heating switch usually uses a mos-type switch. Under the influence of a single particle, this mos-type switch has a certain probability of being broken down and failing, resulting in continuous heating and burning of the inertia in the inertial group. sensor

[0005] To sum up, there are safety problems in the current commonly used temperature control circuit, and it is difficult to meet the temperature control requirements of the launch vehicle inertial measurement combination

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