Vehicle-mounted terminal power failure detection circuit and method

A vehicle-mounted terminal and power-down detection technology, which is applied in the direction of measuring current/voltage, measuring devices, measuring electrical variables, etc., can solve problems such as large dormant current, and achieve the effects of avoiding poor real-time performance, small temperature drift, and high real-time performance

Pending Publication Date: 2020-09-29
XIAMEN YAXON NETWORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By detecting the voltage value of the external power supply, the MCU can make a judgment whether the power is off, but in sleep mode, the MCU needs to wake up regularly to detect the voltage value to judge whether the power is off, so the sleep current is relatively large

Method used

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  • Vehicle-mounted terminal power failure detection circuit and method
  • Vehicle-mounted terminal power failure detection circuit and method

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] see Figure 1 to Figure 2 As shown, a vehicle-mounted terminal power-down detection circuit of the present invention includes: a vehicle-mounted terminal DC-DC power supply module U1, a sampling capacitor C6, a rectifier diode D3 and a rectifier diode D4, a triode switch circuit and an MCU module; the triode switch circuit includes Transistor Q1, first resistor R1, second resistor R2 and third resistor R3; the input terminal of the vehicle terminal DC-DC power module is connected to the vehicle battery; the switch signal output terminal of the vehicle terminal DC-DC power module Connected to one end of the capacitor C6; the other end of the capacitor C6 is connected to the anode of the rectifier secondary terminal D3; the cathode of the r...

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Abstract

The invention discloses a vehicle-mounted terminal power failure detection circuit and method. The vehicle-mounted terminal power failure detection circuit comprises a vehicle-mounted terminal DC-DC power supply module, a sampling capacitor C6, a rectifier diode D3, a rectifier diode D4, a triode switching circuit and an MCU module. An input end of the vehicle-mounted terminal DC-DC power supply module is connected with an automobile storage battery; a switching signal output end of the vehicle-mounted terminal DC-DC power supply module is connected with one end of a capacitor C6; the other end of the capacitor C6 is connected with an anode of the rectifier diode D3; a cathode of the rectifier diode D3 is connected with the cathode of the rectifier diode D4; one end of the triode switchingcircuit is connected with the cathode of the rectifier diode D3 so as to perform level conversion; and the other end of the triode switching circuit is connected with an input end of the MCU module to detect whether the automobile storage battery is powered down. The circuit and the method are small in temperature drift and good in real-time performance, and a state of an external power supply isjudged by detecting whether the vehicle-mounted terminal DC-DC power supply module works normally or not.

Description

technical field [0001] The invention relates to the technical field of vehicle-mounted terminal power-down detection, in particular to a vehicle-mounted terminal power-down detection circuit and method. Background technique [0002] At present, many vehicle-mounted terminals must have a power-off reminder function. For example, JTT 794-2011 clearly requires that the vehicle driving recorder must have a power-off reminder function. Therefore, the reliability of the power-off detection circuit is of great importance. The traditional power-off detection circuit is generally divided into two types: switch value detection and analog value detection. [0003] The existing switch value detection generally obtains the signal source from the external power supply or the DCDC converted power supply inside the equipment, and detects the power level. There are some unstable factors in this method. If the external power supply is used as the switch value judgment, the threshold of the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165
CPCG01R19/165
Inventor 朱仙锋涂艺斌
Owner XIAMEN YAXON NETWORKS CO LTD
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