Novel radar sensor time-sharing power-saving circuit

Abstract

The invention discloses a novel radar sensor time-sharing power-saving circuit which is used for avoiding overlong starting time consumption of a radar chip so as to save power, and the circuit comprises a main control circuit, a radar chip circuit, an intermediate frequency voltage maintaining circuit and an intermediate frequency circuit, the main control circuit is electrically connected with the radar chip circuit and the intermediate frequency circuit respectively; the radar chip circuit is electrically connected with a radar power supply through a first field effect transistor Q1 of themain control circuit, and the radar chip circuit is further electrically connected with the intermediate frequency circuit through a second field effect transistor Q2 and a third field effect transistor Q3 of the intermediate frequency voltage maintaining circuit. According to the novel radar sensor time-sharing power-saving circuit disclosed by the invention, the three MOS transistors are used for respectively controlling the on-off of the power supply of the radar chip and the keeping of the radar output voltage, and different circuit states are switched through an analog switch, so that theoverlong starting time consumption of a radar system is avoided, and the purpose of power saving is achieved.

Description

technical field [0001] The invention belongs to the technical field of time-sharing power saving of radar sensors, and in particular relates to a novel time-sharing power saving circuit of radar sensors. Background technique [0002] The 24GHz radar sensor occupies a certain market in the application of the Internet of Things, and it has many applications in smart home, smart transportation, and smart electrical. However, the working power consumption of 24GHz is relatively large. In a 5V environment, there is generally a working current of about 50mA. The purpose of saving power can be achieved by letting the radar chip work in time-sharing. However, due to the slow startup time of the radar circuit, it takes a long time for the radar to turn off and start, which cannot meet the needs of power saving. [0003] During the start-up process of the radar, the op amp and other devices in the intermediate frequency amplifier circuit will bring a large start-up delay, which is th...

AI Technical Summary

Problems solved by technology

But the working power consumption of 24GHz is relatively large. In the 5V environment, there is generally a working current of about 50mA

The purpose of saving power can be achieved by letting the radar chip work in time-sharing. However, due to the slow startup time of the radar circuit, it takes a long time for the radar to turn off and start, which cannot meet the needs of power saving.

[0003] During the start-up process of the radar, the op amp and other devices in the intermediate frequency amplifier circuit will bring a large start-up delay, which is the main reason for the slow start-up time. It takes hundreds of milliseconds to reach the stable state of the circuit.

Among them, the most influential is the output voltage of the radar chip. When the radar chip is turned off to on, the signal output will jump from 0 volts to 1.6 volts. This jump will cause the subsequent intermediate frequency amplifier circuit to be completely saturated. Returning to a stable state, the above will cause the radar system to take too long to start, waste power and other problems

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