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A full-coverage real-time self-diagnosis voltage detection circuit, electronic equipment and automobile

A voltage detection circuit and voltage detection technology are applied in the field of voltage detection circuits and automotive electronic products, which can solve the problems of loss of voltage detection in circuits, failure of circuits to detect abnormal comparators, and hidden dangers of chip reliability and safety, so as to improve safety. effect of level

Active Publication Date: 2016-08-31
郑鲲鲲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the circuit cannot detect whether there is an abnormality in the two comparators themselves and whether the connection line between the output point and the logic operation output of the next stage is abnormal, such as the following scenario: the output of comparator 1 (COMPARATOR1) or the comparator When the output of 2 (COMPARATOR2) is internally short-circuited to the reference ground (GND) due to the chip's own problems (including internal circuit devices or metal wires connecting devices), that is, one or both of CMOP1_OUT and COMP2_OUT is low "0" level, In this scenario, the circuit loses the function of voltage detection
In this way, there is a big hidden danger in the reliability and security of the chip itself.

Method used

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  • A full-coverage real-time self-diagnosis voltage detection circuit, electronic equipment and automobile
  • A full-coverage real-time self-diagnosis voltage detection circuit, electronic equipment and automobile

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Embodiment Construction

[0025] In order to make those skilled in the art understand the technical solution of the present invention more clearly, the specific implementation manner thereof will be described below in conjunction with the accompanying drawings.

[0026] The invention provides a real-time voltage comparator circuit with full fault coverage and self-detection.

[0027] In a specific embodiment, the specific circuit such as figure 2 Shown:

[0028] The detection circuit consists of four modules:

[0029] Module 1: Voltage feedback stage: R1, R2, R3;

[0030] Module 2: switch between two options;

[0031] Module 2: voltage detection level: comparator;

[0032] Module 3: logic operation level: XOR gate;

[0033] Specific connection implementation: R1, R2, and R3 are connected in series, one end is connected to the detected voltage, such as the battery voltage, and the other end is connected to the ground; the two inputs of the two-choice switch are respectively connected to the overvo...

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Abstract

The invention discloses a voltage detection circuit with full fault coverage and real-time self-diagnosis, and electronic equipment and automobiles including the voltage detection circuit. The logical operation module, the one-of-two switch switch includes switches S1 and S2. The central controller can obtain the fault signal in real time regardless of the detected voltage or any possible fault in the detection circuit. This circuit can turn single-point faults and residual faults into detectable faults, greatly improving The safety level of the circuit.

Description

technical field [0001] The invention relates to an automotive product, in particular to an automotive electronic product, in particular to a voltage detection circuit. Background technique [0002] With the rapid development of modernization and technology, various electronic devices are widely used in people's life and production. Therefore, real-time voltage monitoring and comparison circuits are also widely used in almost all electronic equipment. With the improvement of living standards, people put forward higher and higher requirements for the safety and failure rate of electrical equipment. Especially in the application of automotive electronic products, the ISO26262 safety level standard is proposed, which requires not only the abnormal voltage to be detected in real time, but also the fault of the detection circuit to be detected in real time, thereby improving the safety of the entire circuit Levels and deratings may lead to life and health hazards in the event of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165G01R31/02
Inventor 郑鲲鲲李明
Owner 郑鲲鲲