Temperature detection circuit

• Main Author: SONG DEFU
• Format: Patent
• Language: Chinese; English
• Published: 16.11.2018
• Subjects: CONTROLLING; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

The invention provides a high-precision temperature detection module. The temperature detection module includes five MOS transistors, five resistors and two BJTs. The temperature detection module of the circuit improves the temperature coefficient by adjusting the ratio of the resistance values of two branches of a current mirror, an output stage of a cascode (vertical cascade) structure is adopted, the linearity of an output curve is improved by using a higher-order curvature compensation method, and the circuit has the advantages that the temperature coefficient is high, the influence of process parameter variation on the circuit in small, and the voltage stability is good. The temperature detection modular circuit is simple in structure, a standard CMOS process is adopted, masks and processes are not increased, and the process cost is reduced. The temperature detection module can be applied not only to LED lighting driving circuits and power management chips, but also in other occasions where changing temp