Voltage detecting circuit in vehicle-mounted equipment and vehicle-mounted equipment

Abstract

The invention provides a voltage detecting device in vehicle-mounted equipment and the vehicle-mounted equipment. The voltage detecting device comprises a microcontroller and a voltage detecting circuit. The voltage detecting circuit comprises a voltage output end Vo, an enabling end Ven, a voltage input end Vi, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first audion Q1 and a second audion Q2. The voltage output end Vo is connected with an input pin of an A / D converting circuit arranged in the microcontroller. The enabling end Ven is connected with an I / O port of the microcontroller. The voltage input end Vi is connected with an energy storage element. The microcontroller comprises a first level operation module, a sampling module and a voltage computing module. Under the condition that extra power loss is not increased basically, the voltage of the energy storage element higher than the input voltage of the I / O port of the microcontroller is detected.

Description

technical field [0001] The invention relates to the technical field of vehicle equipment, in particular to a voltage detection circuit in the vehicle equipment and a vehicle equipment. Background technique [0002] At present, in order to achieve intelligent, real-time, and dynamic management of vehicles, a communication protocol suitable for roads and vehicles in the field of intelligent transportation has been specially developed internationally, that is, Dedicated Short Range Communication (DSRC, Dedicated Short Range Communication) protocol. DSRC system is a wireless communication system that organically connects vehicles and roads through two-way transmission of information. It mainly includes three parts: on-board equipment (OBU, On-Board Unit), roadside equipment, and DSRC protocol. [0003] The on-board equipment needs a strong power module to provide enough power for the working modules (card reader module, DSRC receiving and transmitting module, etc.). Traditional...

AI Technical Summary

Problems solved by technology

However, using resistors for voltage division can easily generate current on the voltage divider resistors, increasing power consumption and wasting electric energy

That is to say, the method of directly using resistors for voltage division is not applicable when the measured voltage is higher than the input voltage of the microcontroller I / O port and the power consumption control is strict.

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