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
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[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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